--- title: "Supabase vs Firebase for Solo Developers" description: "Supabase wins for SQL web apps with flat pricing and no lock-in; Firebase wins for mobile apps needing offline sync. Here's how a solo dev should pick." date: 2026-07-02 updated: 2026-07-02 category: dev tags: ["supabase","firebase","solo-saas","saas-stack","baas"] canonical: https://intzzzero.dev/supabase-vs-firebase-for-solo-developers/ source: "Between Negative and Positive" language: en --- ## Quick Verdict For a solo developer in 2026, **pick Supabase if you are building a web app with relational data** — users, teams, billing, permissions — because you get real PostgreSQL, a flat and predictable \$25/month Pro plan, and no vendor lock-in. **Pick Firebase if you are building a mobile app** that needs offline sync, real-time updates, and the most mature client SDKs, and you are comfortable with a NoSQL document model and pay-as-you-go billing. Both free tiers are generous enough to launch and validate on, so this is not "free vs paid" — it is SQL vs NoSQL, flat pricing vs metered pricing, and portable vs proprietary. This guide maps each choice to a real project shape. ## Comparison Table | Criteria | Supabase | Firebase | |---|---|---| | Data model | PostgreSQL (relational SQL) | Firestore (NoSQL document) | | Free tier | 500 MB DB, 50K MAU, 5 GB egress — pauses after 7 days idle | Firestore 50K reads / 20K writes per day, 1 GiB; 50K MAU | | Pricing model | Flat subscription (Pro \$25/mo per project) | Pay-as-you-go (Blaze), metered per operation | | Bill predictability | High — you know the number | Low — usage spikes reach the invoice | | Query power | Full SQL: joins, aggregations, views, RLS | Limited: no joins, denormalize your data | | Lock-in / portability | Low — open source, pg_dump, self-hostable | High — proprietary Firestore export format | | Auth | 50K MAU free, Postgres-native + row-level security | 50K MAU free, best-in-class mobile/social providers | | Realtime & offline | Postgres change events; web-first | Firestore listeners + offline-first mobile SDKs | | Best for | Web SaaS with relational data | Mobile apps, offline sync, rapid prototyping | | Biggest risk | Free-tier pausing; younger ecosystem | Bill shock; NoSQL modeling pain; lock-in | (All figures verified 2026-07-02. Both platforms change pricing; see the pricing section and confirm before you commit.) ## Choose Supabase If... - Your data is relational — users belong to teams, teams own projects, projects have permissions and billing. SQL handles this naturally; Firestore makes you denormalize and duplicate. - You want a **predictable bill**. Pro is a flat \$25/month per project, not a usage meter you have to watch. - Portability matters to you. It is real PostgreSQL, so `pg_dump` and any Postgres host is your exit, and you can self-host the entire stack. - You want auto-generated REST and GraphQL APIs, TypeScript types from your schema, and row-level security living next to your data. - You are a web/full-stack developer and your client is a browser, not primarily a phone. ## Choose Firebase If... - You are shipping a **mobile app** and want the most mature iOS/Android SDKs, offline-first sync, and push out of the box. - Your data is naturally document-shaped and you do not need joins or complex relational queries. - You want to prototype fast and are happy trading long-term portability for day-one velocity. - Your usage is light and spiky, and you would rather pay \$0 at rest than a flat \$25/month floor. - You are already deep in Google's ecosystem (Analytics, Cloud Messaging, Crashlytics) and want it integrated. If neither list clearly wins and you are building a web SaaS with real relationships in the data, the default is Supabase — the SQL model and the flat bill are the safer long-term bet for one person. ## Feature-by-Feature ### Data Model: SQL vs NoSQL (the choice everything else follows from) This is the decision that drives all the others, so start here. **Supabase is PostgreSQL** — a relational SQL database. You define tables and relationships, and you query with joins, aggregations, views, and window functions. When your app has the shape most SaaS apps have (users, teams, subscriptions, permissions), the relational model represents it directly, and constraints keep your data honest. **Firebase's Firestore is a NoSQL document store.** You save documents into collections with no schema defined up front, which feels wonderfully fast at the start. The trade-off shows up when data grows: Firestore has no joins, so you denormalize — duplicating values across documents and keeping copies in sync yourself. A query that is one SQL `JOIN` in Supabase can become several round trips plus client-side stitching in Firestore. Rule of thumb: if you can sketch your data as tables with foreign keys, Supabase will feel like home. If your data is genuinely hierarchical documents that you always read whole, Firestore fits. ### Pricing Model: Flat vs Pay-As-You-Go The two platforms bill on completely different philosophies, and this is where solo developers get surprised. **Supabase is a flat subscription.** Free until you need Pro, then **\$25/month per project**, which includes 8 GB of database, 100 GB file storage, 100,000 monthly active users, and \$10/month of compute credit. Overages exist (\$0.125/GB/month of extra database, \$0.09/GB egress past 250 GB), but the base is a number you can predict and budget. **Firebase is pay-as-you-go (the Blaze plan).** There are only two plans — Spark (free) and Blaze (metered). On Blaze you pay per operation: Firestore reads are **\$0.06 per 100,000**, writes **\$0.18 per 100,000**, deletes **\$0.02 per 100,000**, and storage **\$0.18/GiB per month**. For a light app that can be less than a dollar a month. The risk is asymmetric: a read-heavy list screen, an unindexed query, or a client-side loop bug can multiply reads and land a real invoice — the classic "why is my Firebase bill \$400 this month" story. Supabase's flat plan cannot do that to you. ### Free-Tier Gotchas (the limits that actually bite) Both free tiers are big enough to launch on. The traps are operational, not the headline sizes. - **Supabase pauses free projects after 7 days of inactivity**, and the free plan has no backups. For a side project that is fine; for a product with real signups, a cold database that needs a manual resume is a bad first impression. This single limit — not storage, not user count — is what usually pushes a real product to Pro. - **Firebase Spark shuts a product off for the rest of the month if you exceed its free quota.** The free Firestore allowance is roughly 50,000 reads and 20,000 writes per day; blow past it on Spark and that product stops until the next cycle or until you enable Blaze. So Firebase's free tier fails by going dark, and its paid tier fails by billing you — you pick which failure mode you prefer. ### Authentication Both include auth, and both give you **50,000 monthly active users free** — enough to run a real product without paying for login. **Supabase Auth** is Postgres-native: users live in your database and pair naturally with row-level security, so your access rules sit next to your data. **Firebase Auth** has the edge on turnkey providers and mobile: more social sign-in options wired up out of the box, and the smoothest mobile SDK integration. Two caveats on Firebase: **phone/SMS verification is never free**, even inside the 50K MAU allowance, and enterprise SSO (SAML/OIDC) is free only up to 50 users, then metered. For most solo web apps the auth layer is a wash; for a mobile app, Firebase Auth is the more convenient path. ### Realtime and Offline **Supabase realtime** streams PostgreSQL change events to subscribed clients — great for a live dashboard or collaborative web UI. It is web-first. **Firebase** was built around realtime and offline from the start. Firestore's listeners plus the offline-first mobile SDKs mean a phone app keeps working with no connection and reconciles when it reconnects, with almost no code from you. If offline sync on mobile is a core requirement, this is Firebase's strongest single feature and the clearest reason to choose it. ### Lock-In and Portability This is Supabase's biggest structural advantage and Firebase's biggest structural risk. **Supabase is open source and standard PostgreSQL.** Your exit is `pg_dump` to any Postgres host — Neon, Railway, RDS, a VPS — or self-hosting the whole Supabase stack yourself. Nothing traps your data. **Firebase data lives in Firestore's proprietary format.** Exporting means writing custom scripts, and there is no drop-in path to a relational database on the other side; you would re-model NoSQL documents into SQL tables by hand. A large part of the industry's 2026 shift toward Supabase is precisely this fear of lock-in. If "could I leave in a weekend" matters to you, Supabase answers yes and Firebase answers not really. ### Developer Experience and Ecosystem **Firebase is older and its ecosystem is deeper**, especially for mobile: Crashlytics, Cloud Messaging, Remote Config, and Analytics are all first-party and integrated, and the SDKs are battle-tested. **Supabase is younger but moving fast**, and it wins for web full-stack work — a SQL editor in the dashboard, auto-generated APIs and TypeScript types, and the fact that you are working with plain Postgres that every ORM and tool already supports. Neither is hard to start; they optimize for different clients (mobile app vs web app). ## Real-World Workflow: How I Actually Choose I reach for Supabase by default, and the reason is boring and honest: the apps I build are web-first with relational data, and I do not want to relearn how to model that in documents. When the entities are users, teams, projects, and billing, a Postgres schema with foreign keys writes itself, and the auto-generated TypeScript types mean the database and the code stop drifting apart. The flat \$25/month Pro plan is the other half of it — I would rather pay a predictable floor than watch a usage meter and wonder whether a busy day becomes a bill. The trade-off I have to be honest about is the free-tier pausing. Supabase pausing an idle project after seven days is completely fine while I am building, and genuinely bad the moment real people are signing up against a database that might be cold. That is not a reason to avoid Supabase — it is a reason to upgrade to Pro before launch, not after the first user hits a resume screen. Knowing exactly which limit bites first, and when, is most of what "experience" buys you here. Where I would stop and pick Firebase instead is a mobile app whose headline feature is working offline. Firestore's offline-first sync is the thing Firebase does better than anyone, and reimplementing it on top of Postgres would be the tail wagging the dog. If I were shipping an offline-capable phone app tomorrow, I would take Firebase's lock-in as the price of getting that sync for free — while going in clear-eyed that leaving later means a real migration, not a `pg_dump`. The decision is not which platform is "better." It is which platform's default trade-off matches the app you are actually building. ## Pricing and Cost Considerations Real numbers, with the traps called out. (Verified 2026-07-02.) - **Supabase.** Free: 500 MB database, 1 GB file storage, 50,000 MAU, 5 GB egress, 2 active projects — but projects pause after 7 days idle and there are no backups. Pro: **\$25/month per project**, which removes pausing, adds daily backups, and raises you to 8 GB database, 100 GB storage, 100,000 MAU, plus \$10/month compute credit. Overages: \$0.125/GB/month extra database, \$0.09/GB egress past 250 GB. **Trap:** the pausing on free, and remembering Pro is billed *per project*, so several separate projects means several \$25 lines. - **Firebase.** Free (Spark): Firestore ~50,000 reads and 20,000 writes per day, 1 GiB storage, 50,000 Auth MAU. Blaze (pay-as-you-go): keeps the free quota as an allowance, then Firestore is \$0.06/100K reads, \$0.18/100K writes, \$0.02/100K deletes, and \$0.18/GiB/month storage; Auth past 50K MAU is graduated (~\$0.0055 down to \$0.0025 per MAU); phone/SMS auth is never free. **Trap:** Blaze has no built-in hard cap — set a budget alert in Google Cloud, because a read-heavy bug bills you in real time. A note on predictability: Supabase's risk is that you forget to upgrade before launch; Firebase's risk is that you cannot fully predict the bill in advance. For a solo developer who wants to know the number ahead of time, the flat plan is the calmer choice. For a genuinely light app where paying \$25/month at rest stings, Blaze's near-zero floor is the draw — as long as you set the budget alert. ## Final Recommendation **Default for a web SaaS with relational data: Supabase.** Real SQL fits how your data is actually shaped, the \$25/month Pro plan is predictable, and open-source Postgres means you are never trapped. Upgrade to Pro before launch so free-tier pausing never touches a real user. **Default for a mobile app needing offline sync: Firebase.** Firestore's offline-first SDKs and mature mobile tooling are worth the NoSQL model and the pay-as-you-go bill — just set a Google Cloud budget alert so Blaze cannot surprise you, and accept the lock-in as a known cost. The honest one-liner: **Supabase for web and SQL, Firebase for mobile and offline.** Match the platform's built-in trade-off to the app you are building, not to which brand is louder this year. ## FAQ **Q. Is Supabase or Firebase better for a solo developer in 2026?** A. For a web app with relational data — users, teams, billing, permissions — pick Supabase: you get real SQL, a flat \$25/month Pro plan you can predict, and no lock-in. For a mobile app that needs offline sync and the most mature client SDKs, pick Firebase. Both free tiers are large enough to launch and validate on, so the deciding factors are your data shape and whether you want a portable database or the fastest mobile path. **Q. Which is cheaper, Supabase or Firebase?** A. It depends on your app's shape, not a headline number. Supabase Pro is a flat \$25/month per project, so the bill is predictable. Firebase Blaze is pay-as-you-go — you pay per read, write, delete, and GB stored — so a light app can sit near \$0, but a read-heavy screen or an accidental loop can spike the invoice. Choose Supabase for predictability, Firebase if you want potentially-cheaper-but-metered and you trust your usage. **Q. Can I migrate off Supabase or Firebase later?** A. Supabase is plain PostgreSQL: run `pg_dump` and move to any Postgres host, or self-host the whole stack — it is open source. Firebase data lives in Firestore's proprietary NoSQL format, and exporting it means writing custom scripts with no drop-in path to a relational database. Portability is Supabase's biggest structural advantage; lock-in is Firebase's biggest structural risk. **Q. Does Supabase really pause my database?** A. On the free plan, yes — projects pause after 7 days of inactivity, and there are no backups. That is harmless for a weekend side project but a bad first impression for real signups hitting a cold database. Upgrading to Pro (\$25/month) removes the pausing and adds daily backups. Firebase Spark never pauses, but if you blow a product's monthly free quota it shuts that product off for the rest of the month. **Q. Which has better authentication for a solo developer?** A. Both give you 50,000 monthly active users free. Supabase Auth is Postgres-native and pairs with row-level security, so your access rules live next to your data. Firebase Auth has more turnkey social and mobile providers and better mobile SDKs, but phone/SMS verification is never free even inside the MAU allowance, and enterprise SSO (SAML/OIDC) is limited to 50 users free. ## Related Articles - [The Cheapest SaaS Stack for Solo Developers](/cheapest-saas-stack-for-solo-developers/) — where Supabase sits in the full free-tier stack, with the other layers - [Vercel vs Netlify vs Cloudflare Pages for Solo Developers](/vercel-vs-netlify-vs-cloudflare-pages/) — picking the host that sits in front of your backend - [How I Use Claude Code to Build Small Web Apps](/how-i-use-claude-code-to-build-small-web-apps/) — the build workflow for the product that runs on this backend - [More posts tagged solo SaaS](/tags/solo-saas/) - [Other posts in the dev category](/categories/dev/) --- *Sources: [Supabase pricing](https://supabase.com/pricing), [Firebase pricing](https://firebase.google.com/pricing), [Cloud Firestore pricing](https://cloud.google.com/firestore/pricing), [Google Cloud Identity Platform pricing](https://cloud.google.com/identity-platform/pricing), [Supabase vs Firebase (Supabase)](https://supabase.com/alternatives/supabase-vs-firebase). Pricing verified July 2, 2026.* *Last updated: July 2, 2026.*