Convex vs Redis for Solo Developers

Quick Comparison

Convex Overview

Convex is a backend platform that bundles a document database, server functions, file storage, and realtime subscriptions into a single system. You write your backend logic as TypeScript functions. Queries automatically subscribe to data changes. When a mutation updates a document, every connected client running a query that touches that document gets the new data pushed to it. No WebSocket setup, no cache invalidation logic, no polling.

For solo developers, the appeal is obvious. You skip building an API layer entirely. Define your data schema, write query and mutation functions, and call them from your React frontend. The type safety flows from your schema definition through your functions to your components. Everything stays in sync automatically.

The free tier is generous. As listed on the Convex pricing page (checked 2026-05-28), it includes 1 million function calls, 0.5 GB database storage, 1 GB file storage, and 1 GB of data egress per month, with usage beyond those limits billed pay-as-you-go (for example $2.20 per additional million function calls).

Redis Overview

Redis is an in-memory data structure store. It supports strings, lists, sets, sorted sets, hashes, streams, and more. The primary use case is caching and fast data access. Data lives in memory, so reads and writes are measured in microseconds. Redis is one of the most widely used technologies in web development.

For solo developers, Redis serves as the supporting data layer. Your primary database (Postgres, MongoDB, etc.) stores your core application data. Redis handles the operational stuff: caching expensive queries, storing sessions, rate limiting API endpoints, managing job queues, and powering pub/sub messaging.

You can self-host Redis for free or use managed services like Upstash (serverless, HTTP-based) or Redis Cloud. Upstash updated its free tier, which now provides 256 MB of data and 500,000 commands per month (checked 2026-05-28), plenty for development and small side projects.

Head-to-Head Comparison

By the Numbers (2026)

Specs and adoption signals as of 2026-05-28.

A few things stand out for a solo developer reading these numbers. Redis is the older, far more widely deployed technology. The two main Node clients alone pull more than 28 million npm downloads a week combined, against roughly 731,000 for the Convex client. That gap is not a quality judgment. It reflects that Redis is a general infrastructure primitive used inside almost every stack, while Convex is a younger, more opinionated full backend. Both are genuinely open source now, which removes a common objection. Redis returned to an OSI-approved license (AGPLv3) with Redis 8.0 in May 2025, and Convex open-sourced its backend under FSL Apache 2.0 in February 2025, so you can self-host either one if a vendor relationship is a concern.

Real Cost at Solo-Dev Scale

These tools are not direct substitutes, so a head-to-head price is artificial. What is useful is knowing what each one actually costs for a small launched app, because that is the decision you face. Assume a modest production workload for a solo project: roughly 5 million Convex function calls a month (a small app with real but limited traffic) and a Redis cache doing about 3 million commands a month.

On Convex, 5 million function calls a month sits above the 1 million included on the free tier. The next step is the Professional plan at $25 per developer per month, which includes 25 million function calls and 50 GB of database storage, so a single solo developer pays a flat $25 a month and stays well inside the included limits. If you would rather stay on the free tier and pay only overages, the extra 4 million calls would bill at $2.20 per additional million, about $8.80 a month, though you would give up the Professional features like daily backups and custom domains.

On managed Redis through Upstash, 3 million commands a month is above the 500,000 included free, and Pay as You Go bills $0.20 per 100,000 commands. That works out to roughly $6 a month for the commands (3,000,000 divided by 100,000, times $0.20), plus storage well within the 256 MB to low-GB range for a typical cache. So a small but real Redis cache lands in single-digit dollars per month at this scale.

The honest takeaway is that at solo-dev scale both are cheap. Convex is a flat, predictable $25 a month once you outgrow the free tier and want the paid features, which buys you an entire backend. Self-hosted Redis on a small VPS you already run is effectively free aside from the memory it uses, and managed Redis for a light cache is a few dollars. The real cost difference is not the bill, it is what each bill buys: Convex's $25 replaces an API server, a database host, and your realtime layer, while Redis's few dollars is one fast component bolted onto a stack you are paying for elsewhere.

When to Pick Convex

Pick Convex when you want a complete backend solution and your application needs realtime data sync. If you are building a collaborative editor, a live dashboard, a project management tool, or anything where users see updates as they happen, Convex handles the hardest part automatically.

It is the right choice when you are a solo React developer and you do not want to build a separate API server. Convex functions are your API. You write them in TypeScript, call them from your components, and they execute on Convex's infrastructure. No Express, no tRPC, no API routes to maintain.

Choose Convex when you want to move from idea to working product as fast as possible. The development loop is tight: change a function, see it update in your app immediately. For solo developers racing to validate an idea, this speed matters.

When to Pick Redis

Pick Redis when you already have a backend and database and you need a fast supporting data layer. Caching database queries so your API responds faster, storing user sessions without hitting your primary database, rate limiting endpoints to prevent abuse, and queuing background jobs are all Redis strengths.

It is the right choice when your needs are simple and specific. Redis does a few things extremely well. If you need a cache, Redis is the industry standard. If you need a job queue, Bull or BullMQ built on Redis are battle-tested. If you need pub/sub messaging, Redis handles it natively.

Choose Redis when you want a tool you can use with any stack. Redis works with Node.js, Python, Go, Java, Ruby, and every other major language. It does not care what your frontend looks like or what ORM you use. It fits into any architecture.

The Verdict

Convex and Redis solve fundamentally different problems, and comparing them directly is a bit like comparing a car to a bicycle. They are both useful, but for different situations.

Convex replaces your entire backend: database, API, and realtime infrastructure. Redis supplements your existing backend with fast data operations.

If you are starting a new project and you want the fastest path to a working reactive application, Convex eliminates a lot of backend work. You can build a complete full-stack app without ever setting up an API server, and the realtime features come free.

If you already have a backend and need to make it faster or add operational features like caching and job queues, Redis is the right tool. It has been solving these problems reliably for over 15 years.

Most mature applications end up using both a primary database (or backend platform like Convex) and Redis. But as a solo developer starting out, pick the one that solves your most pressing problem. If that problem is "I need a complete backend quickly," look at Convex. If that problem is "my API is slow and I need caching," look at Redis.

Sources

All figures checked on 2026-05-28.

• Convex pricing (Free and Professional tiers, included limits, overages): https://www.convex.dev/pricing
• Convex self-hosting (open-source backend, Docker): https://docs.convex.dev/self-hosting
• Convex backend repository (stars, languages, license): https://github.com/get-convex/convex-backend
• Convex npm package (version 1.39.1, weekly downloads): https://api.npmjs.org/downloads/point/last-week/convex
• Upstash Redis pricing (Free and Pay as You Go tiers): https://upstash.com/pricing/redis
• Redis 8 GA announcement: https://redis.io/blog/redis-8-ga/
• Redis returns to open source under AGPLv3: https://redis.io/blog/agplv3/
• Redis releases (latest version 8.8.0): https://github.com/redis/redis/releases
• Redis repository (stars, language): https://github.com/redis/redis
• node-redis npm weekly downloads: https://api.npmjs.org/downloads/point/last-week/redis
• ioredis npm weekly downloads: https://api.npmjs.org/downloads/point/last-week/ioredis