Redis vs PlanetScale for Solo Developers

Quick Comparison

By the Numbers (2026)

Every figure below was pulled directly from the official source on 2026-05-29. Where a vendor page blocked automated reads I fell back to the GitHub and npm registry APIs, which are cited in the Sources list.

Redis

• Latest server release: Redis 8.8.0, published 2026-05-25 (github.com/redis/redis releases).
• License since Redis 8: tri-licensed, pick one of AGPLv3, RSALv2, or SSPLv1 (redis.io/legal/licenses). The tri-license landed with Redis 8.0 in May 2025 after Salvatore Sanfilippo rejoined and pushed for an OSI-approved option.
• GitHub stars: 74,585 on redis/redis.
• npm reach: the redis client pulled 9,782,237 downloads in the week of 2026-05-22 to 2026-05-28, and ioredis pulled 18,539,598 in the same window (api.npmjs.org). Combined that is north of 28 million weekly installs across the two main Node clients alone.
• Redis Cloud tiers: free 30MB single DB, Essentials from $5/month (250MB to 100GB), Pro from $200/month minimum with unlimited RAM (redis.io/pricing). Self-hosting on a VPS you already pay for adds nothing.

PlanetScale

• Latest Vitess core: v24.0.1, published 2026-05-07 (github.com/vitessio/vitess releases). The official serverless client @planetscale/database is at 1.20.1 (registry.npmjs.org).
• License: the managed service is proprietary, built on the Apache-2.0 Vitess project; the @planetscale/database client is itself Apache-2.0 (its npm manifest declares "license":"Apache-2.0").
• GitHub stars: 20,976 on vitessio/vitess (the open engine underneath), 1,198 on planetscale/database-js (the client).
• npm reach: @planetscale/database pulled 189,414 downloads in the week of 2026-05-22 to 2026-05-28 (api.npmjs.org). That is roughly 150x fewer weekly installs than the redis plus ioredis pair, which tracks with one being a niche serverless driver and the other being infrastructure half the internet caches against.
• Pricing: no free tier. The cheapest paid cluster is PS-5 single-node at $5/month, high-availability PS-5 (1 primary plus 2 replicas) starts at $15/month, and the Vitess (non-metal) line starts at $39/month (planetscale.com/pricing, AWS us-east-1).

The headline takeaway from the raw numbers: Redis is a default-grade dependency with tens of millions of weekly installs and a free self-host path, while PlanetScale is a focused managed product with no free door and a much smaller client footprint.

Redis Overview

Redis is the in-memory data store that sits behind practically every fast web application. Caching database queries, storing sessions, managing rate limits, running job queues, and enabling real-time pub/sub. All at sub-millisecond speeds. It's not a primary database. It's the tool that makes your primary database's job easier.

I've used Redis in every serious project I've shipped. The pattern is always the same: your app starts getting traffic, database queries become the bottleneck, and adding a Redis cache layer drops response times from hundreds of milliseconds to under one. The data structures (sorted sets, streams, hashes, lists) solve specific problems elegantly without forcing you into workarounds.

Redis Cloud offers a free tier with 30MB, which handles sessions and basic caching for small applications. Self-hosting Redis on a VPS costs nothing beyond your existing server. Either way, Redis is one of the cheapest performance improvements you can make.

PlanetScale Overview

PlanetScale is a serverless MySQL platform built on Vitess, the same technology that powers YouTube's database infrastructure. The headline feature is database branching: create a branch of your production database, test schema changes, and merge them back with zero downtime. No more sweating over migration scripts during deployment.

The developer experience is polished. A web dashboard for managing schemas, a CLI for branching and deployment, and a connection model that works seamlessly with serverless functions. The non-blocking schema change system means your production database never locks up during a migration, which eliminates one of MySQL's biggest pain points.

PlanetScale removed their free tier in 2024 and the pricing has shifted again since. The old $39/month Scaler plan was deprecated, and PlanetScale moved to a cluster-based model under what is now called the Base plan, starting at $5/month for a single-node cluster (per planetscale.com/pricing). There is still no free tier (the docs state plainly that "PlanetScale does not offer a free plan"). PlanetScale also added Postgres alongside its Vitess/MySQL offering, so it is no longer MySQL-only. The cheapest production-grade clusters run higher than the $5 headline once you add high availability, so for weekend experiments it still prices out most indie developers compared to a free self-hosted database.

Key Differences

Fundamentally different tools. PlanetScale is a primary database for persistent relational data. Redis is an in-memory data store for caching, sessions, and real-time features. They don't replace each other. A well-architected application might use both: PlanetScale for permanent data, Redis for the fast layer.

Data persistence. PlanetScale stores your data durably on disk with replication and backups. Your user data, orders, and content are safe. Redis stores data in memory with optional persistence. Redis data is ephemeral by design. Lose the Redis instance, regenerate the cache from your primary database. Lose PlanetScale data, and you have a real problem.

Query model. PlanetScale gives you full MySQL querying. Joins, subqueries, aggregations, window functions, and indexes. Redis uses key-based lookups with specialized data structure operations. If you need to run complex analytical queries across your data, PlanetScale handles it. Redis is for fast lookups of specific keys.

Schema management. PlanetScale's branching model for schema changes is genuinely innovative. Branch your database, make changes, open a deploy request (like a pull request for your schema), and merge with zero downtime. Redis has no schema. You store whatever data structures you want without declaring anything upfront.

Cost for solo developers. Redis is free to self-host and cheap on cloud providers (Redis Cloud has a free 30MB tier and Essentials plans from $5/month). PlanetScale's Base plan also starts at $5/month, but there is no free tier at all, so the floor is a paid subscription from day one. For solo developers watching every dollar, the difference is "free self-host" versus "pay before you ship," and that gap alone makes PlanetScale harder to justify for side projects.

Ecosystem fit. PlanetScale used to be MySQL-only, but it now offers Postgres as well (per planetscale.com/pricing), so an ORM expecting Postgres can work. Redis works with any tech stack because it's a supplementary data store, not a primary database.

When to Choose Redis

• You have a primary database and need caching for better performance
• Session management, rate limiting, or job queues are requirements
• You want real-time pub/sub messaging between services
• Budget is tight and you need free or near-free tools
• Your application needs sub-millisecond data access for specific use cases

When to Choose PlanetScale

• You need a managed MySQL or Postgres database with zero-downtime migrations
• Database branching for testing schema changes safely is important
• Your application is built around MySQL and needs Vitess-scale reliability (the same Vitess project that powers YouTube, now at 20,976 GitHub stars)
• You have revenue to justify a paid plan from day one, since there is no free tier
• Non-blocking schema changes are critical for your deployment workflow

Real Cost at Solo-Dev Scale

These two are complementary, not interchangeable, so the honest cost question for a solo developer is "what does my caching layer cost" versus "what does my primary database cost." Here is the math at a realistic side-project scale, using only the per-unit rates I verified on 2026-05-29.

Stated workload (assumptions): one launched side project doing modest traffic. You need a small cache and session store (well under 250MB of hot keys) and a single small primary database (under 1GB, no need for multi-region replicas yet). One environment, no team.

Caching layer with Redis

• Redis Cloud free tier: 30MB, $0/month. Fine if your hot set is genuinely tiny (sessions plus a handful of cached queries).
• Redis Cloud Essentials: from $5/month for 250MB and up, the realistic floor once you outgrow 30MB (redis.io/pricing).
• Self-host on a VPS you already run: $0 incremental, because Redis is free under any of its three licenses (redis.io/legal/licenses).
• Realistic solo-dev caching cost: $0 to $5/month.

Primary database with PlanetScale

• There is no free tier, so the floor is a paid subscription on day one (planetscale.com/pricing).
• Cheapest production option: PS-5 single-node at $5/month, but single-node means no replica and no automatic failover.
• First genuinely production-grade option: PS-5 high-availability at $15/month for the 1-primary-plus-2-replica layout.
• Realistic solo-dev primary-DB cost on PlanetScale: $5/month bare minimum, $15/month for HA.

Same workload on free-tier Postgres instead

• Neon free plan: 0.5GB storage per branch with a 5GB aggregate cap and 100 CU-hours per project per month (neon.com/pricing). $0/month for this workload.
• Supabase free plan: 500MB database size (supabase.com/pricing). $0/month for this workload.

Putting it together (monthly, realistic side-project scale):

The decision rule falls out of the table. If you specifically need MySQL or Vitess-style branching and zero-downtime deploy requests, PlanetScale's $5 to $15/month is reasonable and the workflow is genuinely better than hand-rolled migrations. If you are Postgres-flexible and watching every dollar, pairing Redis with a free Neon or Supabase Postgres gets you the same architecture (fast cache plus durable primary) for $0 to $5/month, because the only line item you cannot zero out is the cache, and even that is free until your hot set crosses 30MB.

The Verdict

These tools serve different roles, and comparing them directly misses the point.

PlanetScale is a primary database for storing your application's persistent data. Redis is a utility layer for caching, sessions, and real-time features. Most applications that use PlanetScale would also benefit from Redis. They're complementary.

But if I'm advising a solo developer on which to invest in first, Redis wins on value. It's free to self-host, cheap in the cloud, and improves the performance of any application with a primary database. PlanetScale's lack of any free tier (the Base plan starts at $5/month and climbs once you add high availability) makes it a hard first recommendation for solo developers, especially when Neon and Supabase offer Postgres with generous free tiers.

If you specifically need MySQL (maybe you're running a Laravel or WordPress-adjacent application), PlanetScale's branching and zero-downtime migrations are worth the cost. But for most solo developers, I'd recommend Neon or Supabase for your primary database and Redis for your caching layer. That combination costs less and gives you more flexibility than PlanetScale alone.

Sources

All figures verified on 2026-05-29.

• Redis 8.8.0 release (version, date): https://github.com/redis/redis/releases/tag/8.8.0
• Redis tri-license (AGPLv3 / RSALv2 / SSPLv1): https://redis.io/legal/licenses/
• Redis Cloud pricing (free 30MB, Essentials from $5, Pro from $200): https://redis.io/pricing/
• redis/redis GitHub stars: https://github.com/redis/redis
• 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
• Vitess v24.0.1 release (version, date): https://github.com/vitessio/vitess/releases/tag/v24.0.1
• vitessio/vitess GitHub stars: https://github.com/vitessio/vitess
• planetscale/database-js GitHub stars: https://github.com/planetscale/database-js
• @planetscale/database version 1.20.1 and Apache-2.0 license: https://registry.npmjs.org/@planetscale/database/latest
• @planetscale/database npm weekly downloads: https://api.npmjs.org/downloads/point/last-week/@planetscale/database
• PlanetScale pricing (no free tier, single-node from $5, HA from $15, Vitess from $39): https://planetscale.com/pricing
• Neon free plan limits (0.5GB per branch, 100 CU-hours): https://neon.com/pricing
• Supabase free plan limits (500MB database): https://supabase.com/pricing