Supabase vs Firebase for a Solo Android Developer

I have been publishing Android apps under Strato Inc since 2020. Every backend I shipped before mid-2023 was Firebase: Auth, Firestore or Realtime Database, Cloud Storage, the occasional Cloud Function. It worked. It also felt like renting an apartment where the landlord can change the lease and you have no SQL escape hatch.

This summer I was between major products and had time to test Supabase seriously — not a weekend hello-world, but “could I rebuild a Strato-scale app on this stack?” Here is the comparison as of July 2023, from a solo developer in India with one laptop and no DevOps team.

What Each Stack Actually Is (July 2023)

Firebase is Google’s managed BaaS. You think in documents, security rules, and Google Cloud billing. The Flutter SDK is mature. The mental model is “append JSON, pray for indexes.”

Supabase is an open-source layer on PostgreSQL: database, auth, storage, edge functions, and realtime subscriptions. You can use their hosted cloud or self-host with Docker. The mental model is “it’s Postgres with batteries.”

Neither is magic. Both will waste your weekend if you skip reading the security model.

flowchart LR
    subgraph firebase [Firebase - July 2023]
        FA[Firebase Auth]
        FS[Firestore / RTDB]
        FST[Cloud Storage]
        CF[Cloud Functions]
    end

    subgraph supabase [Supabase - July 2023]
        SA[Supabase Auth]
        PG[PostgreSQL]
        SST[Supabase Storage]
        EF[Edge Functions]
        RT[Realtime on Postgres]
    end

    App[Flutter Android app] --> firebase
    App --> supabase

Where Firebase Still Wins

Flutter integration depth. Firebase’s Flutter plugins are first-party energy. Auth flows, crashlytics hooks, analytics — if you live entirely in Google land, the path of least resistance is real.

Document model for chaotic prototypes. When your schema changes every week because you are 18 and still figuring out the product, schemaless documents forgive you. Postgres wants migrations. Migrations want discipline.

Offline sync on mobile. Firestore’s offline persistence story was still ahead of what I could get working with Supabase + Postgres in the same afternoon in July 2023. For field apps with flaky 3G, that mattered.

I already knew the failure modes. After two years on Firebase I knew where the bills spike, where rules get weird, where composite indexes bite. Switching stacks has a learning tax.

Where Supabase Pulls Ahead

SQL. Joins. Aggregations. SELECT statements that do not feel like a crime. If your app has reporting, ledgers, or anything relational, fighting Firestore’s query limitations gets old fast.

Row Level Security (RLS). Policies live in the database. In July 2023 this was Supabase’s killer feature for me: auth-aware Postgres rules that feel closer to how a real backend should enforce access. Firebase Security Rules work, but debugging them at 1 AM is a different kind of suffering.

Open source and portability. The project is on GitHub. You can self-host. If Supabase-the-company changes pricing or disappears, you are not locked to a proprietary document store — you have Postgres dumps and a migration path.

Pricing transparency at hobby scale. Firebase’s free tier is generous until it is not. Firestore reads add up quietly. Supabase’s hosted tiers in 2023 were straightforward for a side project: Postgres size, bandwidth, monthly active users. I could spreadsheet it without a PhD in Google Cloud billing.

Edge Functions (Deno). By mid-2023 Supabase Edge Functions were usable for webhooks and light API glue. Firebase Cloud Functions were the incumbent. Neither is fun, but having TypeScript at the edge next to your database is a nice mental stack.

What I Tested Hands-On

I did not migrate a production app. I rebuilt a slice of a familiar pattern:

1. Email + magic link auth
2. User-owned rows in a table with RLS
3. Image upload to object storage with signed URLs
4. A realtime listener when a row changes

Auth: Both worked in Flutter. Supabase’s Flutter client was fine in July 2023 — not as polished as Firebase Auth’s docs ecosystem, but not scary.

Queries: Supabase won any “show me orders grouped by restaurant” task in one SQL file. Firestore wanted composite indexes and denormalized counters.

Realtime: Firebase felt snappier out of the box on mobile. Supabase realtime over Postgres changes worked, but I spent more time wiring listeners and understanding replication slots in docs.

Self-host curiosity: I spun up Supabase locally with Docker once. It is not trivial — you are operating Postgres, Kong, GoTrue, etc. For a solo dev, hosted Supabase is the realistic choice. Self-host is a flex for when you outgrow free tiers or have ops help.

The India / Solo-Dev Constraints

Latency: Both hosted stacks serve from regions you pick. For Indian users, region choice matters more than brand. Measure RTT; do not assume.

Payment friction: Firebase bills through Google. Supabase bills through Stripe. Neither is perfect for a teenager with a debit card and anxiety about surprise charges. Set billing alerts on day one.

Sleep budget: Firebase lets you ignore ops until you cannot. Supabase still hides most ops in hosted mode, but Postgres backups and migration discipline are on you eventually.

What Supabase Did Not Have (Yet, in July 2023)

I am writing this in July, so I will not pretend I know what ships next quarter.

As of now I would not bet a production app on:

• Supabase matching Firebase’s full mobile offline story without custom work
• Edge Functions replacing a proper backend when you need long-running jobs
• “We will self-host” as a plan with zero ops experience (I include myself)

I also had not seen Supabase become the default answer in every Flutter tutorial. Firebase still owns the beginner funnel.

My Actual Decision in Summer 2023

I did not rip Firebase out of live apps. Users do not care about your ideological preference for SQL.

I did start new experiments on Supabase when the data model was relational from day one — anything with settlements, ledgers, or reporting. I kept Firebase for fast document-shaped prototypes and apps where offline-first mobile was the core requirement.

That split stack is annoying. It is also honest for a solo publisher without a platform team.

Takeaway

If you are a solo Android developer choosing in July 2023:

• Pick Firebase when you need the fastest Flutter path, document flexibility, and offline mobile sync — and you accept vendor shape.
• Pick Supabase when you want Postgres, SQL, RLS, and open-source exit ramps — and you will read the docs instead of cargo-culting rules.

There is no correct answer for all apps. There is a correct answer per schema, and most founders pick Firebase first because the tutorial did.

I am glad I ran this comparison while I had summer hours. College was coming. Side projects would get shorter. Knowing where SQL beats documents saves you a rewrite later — even if later-me still has not learned to love migrations.