ai tools · roundup
The best AI apps for solo developers — five that earn their subscription.
verdict
Most "best AI apps" lists are written for consumers with a company card. This one is for a developer paying out of pocket. Five tools make the cut: Claude Code for shipping code, Writesonic for marketing copy, Frase for content research, ElevenLabs for voice inside your product, and Systeme.io for the launch itself. Two of them cost nothing to start and one pays me no commission at all.
There are thousands of AI apps and almost none of them change your week. The ones below do, because each replaces something you're currently doing by hand — not something you'd merely enjoy having open in a tab. Everything here runs in a real one-person stack on a cheap VPS; nothing was included because a vendor asked.
How these were vetted
A tool had to clear all four bars to make the list. Most popular AI apps fail on the first one:
| Priced for one person | A single card, not a seat-based team plan with a minimum of five |
|---|---|
| Replaces manual work | Gives back hours you're already spending — not a new habit to maintain |
| Evaluable for free | A free tier or trial substantial enough to reach a real verdict before paying |
| No lock-in | Your output leaves in a standard format when you stop paying |
Cost vs developer velocity, at a glance
| Tool | The job it does | Cost shape | What you get back |
|---|---|---|---|
| Claude Code | Writes and ships code, runs commands | Flat subscription, or metered API | Whole tasks, not autocomplete |
| Writesonic | Landing pages, product copy, drafts | Low monthly, hobby-friendly | The marketing you keep postponing |
| Frase | Research → outline → brief | Low monthly | Hours per article |
| ElevenLabs | Voice inside your product | Free tier, then per-character | A feature you'd otherwise skip |
| Systeme.io | Email list, landing pages, funnels | Genuinely free to start | Two or three subscriptions replaced |
1. Claude Code — for actually shipping
The largest velocity gain on this list, and it pays this site nothing. It's an agent rather than an autocomplete: you hand it a task — "add a page, rebuild, deploy it to my server" — and it edits the files, runs the commands, and reports back. The pages you're reading were deployed that way.
Cost control matters more here than with anything else on the list, because agentic work is token-hungry. A flat subscription caps your bill by design; an API key does not. Full walkthrough: installing Claude Code in 2026.
2. Writesonic — for the marketing you keep postponing
Every solo dev has a landing page that reads like a README. Writesonic's entry tier is impulse-buy territory and gets a hero section or product description 90% of the way there in one pass, which is the right trade when content isn't your revenue engine yet. Jasper is the better tool at volume and priced accordingly — the comparison is in Writesonic vs Jasper.
3. Frase — for content that gets found
Writing articles nobody searches for is the most expensive free activity in indie hacking. Frase turns a keyword into a brief: what the ranking pages cover, which questions to answer, how to structure it. It earns its keep from roughly one article a week upward; below that, skip it and put the money toward hosting. See Surfer vs Frase.
4. ElevenLabs — for voice inside your product
API-first and the quality reference everyone else is measured against, with a free tier big enough to prototype on. The one discipline it demands: cache generated audio like any other expensive computation, because billing scales with characters. Pre-render anything static and a small app's voice bill stays in single digits. Producing voiceovers rather than shipping a feature? That's a different tool — ElevenLabs vs Murf.
5. Systeme.io — for the launch
Not the flashiest AI on the list, but the one that most often converts work into money: an email list, a landing page, and a funnel on a free plan that's the real product rather than a trial in costume. When your caps start hurting, your project is working. Details and the catches: Systeme.io review.
What the true cost looks like at scale
Sticker price is the smaller half of the bill. Three patterns to plan around:
Per-token and per-character tools bill by appetite, not by month. Claude Code on an API key and ElevenLabs in production both scale with usage. Set a spend limit before your first heavy session, not after your first surprising invoice.
Subscriptions stack silently. Five tools at "only" a low monthly each is a real line on your budget before a single user has paid you anything. Two of the five here start free — start there and upgrade only when you can name the feature you're missing.
The infrastructure underneath is the cheap part. Everything above runs against a server that costs less than one of these subscriptions. See how I run everything from a $5 VPS and the best VPS under $10.
What got left off, and why
Consumer chat apps and image generators are missing on purpose — they're fun, they're not velocity. Team-priced AI suites are out because a five-seat minimum is not a solo tool. Anything whose free tier is too thin to reach a verdict on is out, because "trust us, upgrade" is not evaluation. And several tools with generous affiliate programs are absent for the simplest reason available: they didn't clear the four bars.
Starting from nothing? The cheapest possible foundation is a small server and a free credit — launch a side project for $0.
Some links on this page are affiliate links — if you sign up through them, SoloStack earns a commission at no extra cost to you. I only list tools I'd run on my own server. Full disclosure.