Prompt Enhancer: a focused RewriteBar alternative for LLM prompt authors
If you’re looking for a RewriteBar alternative, here’s an honest comparison. Both Prompt Enhancer and RewriteBar live in your macOS menu bar and trigger on selected text. That is where the similarity ends.
RewriteBar is a general writing assistant. It fixes grammar, adjusts tone, summarizes, translates into 500+ languages, and rewrites prose for style. If you write emails, Slack messages, or documentation and want quick style polish, it does that well.
Prompt Enhancer solves a different problem: it structures draft text into a proper LLM prompt using Anthropic’s official XML format — <role>, <context>, <task>, <output_format> — in place, in under ~4 seconds. The output is ready to paste into Claude.ai, Claude Code, ChatGPT, or any other model. Not “better-sounding text.” A machine-parseable, structured prompt.
What each tool actually does
RewriteBar: select text → get rewritten prose. Optimized for human readers: cleaner sentences, different tone, translated language. Uses 41 AI models. Strong grammar/style engine. Works system-wide.
Prompt Enhancer: select a rough draft prompt → get XML-structured prompt. Optimized for LLM parsers: role defined, context separated, task explicit, output format specified. Uses Claude (Anthropic API) exclusively — because Anthropic’s XML standard is the target format.
Neither is a replacement for the other. If you are a developer writing 30 prompts a day in Claude Code or Cursor, Prompt Enhancer addresses the friction you actually feel. If you want polished human-readable prose across all contexts, RewriteBar is the right tool.
The XML structuring argument
LLMs respond better to structured prompts. Anthropic published guidance on using XML tags to separate prompt components. Most users ignore this — not because they disagree, but because hand-writing XML wrappers around every prompt is tedious.
Prompt Enhancer automates exactly that step. You write a natural-language draft. Press ⌃⌥⌘P. The app sends the draft to Claude with a meta-prompt that produces the XML-wrapped version. You get back a structured prompt you can use immediately or tweak.
RewriteBar does not do this. It makes text more readable — which is useful, but different.
Works in the same apps
Both tools work system-wide on macOS: Claude.ai, ChatGPT, VS Code, Cursor, Notion, Slack, Figma, Linear, Telegram, Mail, Safari, Chrome. Any app that lets you select text.
Choose Prompt Enhancer if
- You work with Claude, Claude Code, or any LLM daily and want structured prompts, not just better prose.
- You already have an Anthropic API key and want a $0 marginal-cost workflow.
- You want a one-time payment with no subscription.
- You need Windows support alongside macOS.
Choose RewriteBar if
- You want general grammar/style/tone improvement for human-readable writing.
- You need translation into a wide range of languages.
- You want access to multiple AI models (41 providers).
- You are not primarily an LLM prompt author.
Ready to try the XML-structured approach? See pricing and download — 3 free enhancements, no signup, then a 7-day free trial.
How this RewriteBar alternative compares
| Feature | Prompt Enhancer | Alternative |
|---|---|---|
| Primary purpose | Structures text into Anthropic XML prompt format | Rewrites prose for grammar, tone, style |
| Output optimized for | LLM parsers (Claude, ChatGPT, etc.) | Human readers |
| AI model used | Claude / Anthropic API exclusively | 41 AI models (user’s choice) |
| Free tier | 3 free, no signup | 100 free requests |
| BYOK (own API key) | Pro feature; stored in macOS Keychain, direct to api.anthropic.com | $29 one-time license |
| Subscription option | None | $5/month or $40/year |
| One-time purchase | $29 (Pro managed) | $29 (BYOK license only) |
| Multi-OS | macOS, Windows & Linux ($29 per platform) | macOS only |
| Privacy / data routing | BYOK: traffic goes directly to Anthropic, no proxy, no logs | Managed API service (RewriteBar servers) |
| Translation | Not a feature | 500+ languages |
| App size | ~793 KB, native Swift, Apple Silicon | ~25 MB |
| Code signing / notarization | Yes — signed & notarized (macOS, June 2026); Windows code-signing in progress | Signed and notarized |
Honest caveats
- The macOS DMG is Apple-notarized since June 2026 — installs without Gatekeeper warnings. The Windows installer shows a one-time SmartScreen prompt while code-signing reputation builds.
- Prompt Enhancer is brand new — public beta launched 2026-05-23, v0.1.1 shipped 2026-05-27. No track record yet. RewriteBar has an established user base and published reviews.
- Prompt Enhancer only uses the Anthropic API (Claude). If you want GPT-4o, Gemini, Mistral, or local models, RewriteBar’s 41-model support is a genuine advantage.
- RewriteBar’s translation into 500+ languages is a real capability Prompt Enhancer does not offer at all.
- RewriteBar’s free trial gives 100 requests vs Prompt Enhancer’s 3 free enhancements + a 7-day free trial — different shapes of free.
- Linux is not available for Prompt Enhancer (Q3 2026 waitlist). RewriteBar is macOS only as well, but the gap matters if you are cross-platform.