Lacuna vs RhymesLab
Lacuna
lacuna.fm
RhymesLab
rhymeslab.comSide by side
| Figure | Lacuna | RhymesLab |
|---|---|---|
| Price from | $9.50/mo | $9.99/mo |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| macOS | Yes | — |
| iOS | Yes | — |
| API | Yes | — |
| Plans published | 10 | 15 |
| Spec score · AI lyric generators | 9.3 (#1) | 8.5 (#5) |
| Integrations | The developer API can be called through REST, a typed TypeScript client, a command-line toolkit or MCP. | No third-party integrations are listed in the public Help Center or pricing pages opened. |
| Support | Support is offered through email and a Discord creator community. | The Help Center provides email support at [email protected] and a bug-report link. |
| What it does | Lacuna is a browser-based AI music workspace that turns prompts or user lyrics into vocal or instrumental songs and supports later editing, enhancement and sharing. | RhymesLab is a browser-based lyrics writing and editing platform combining rhyme analysis, AI assistance, syllable counting and flow metrics. |
Plans
Lacuna
- Basic$9.50 a month
- Pro$24.50 a month
- Ultra$49.50 a month
- FreeFree
- Credit Pack S$50, paid once
- Credit Pack M$100, paid once
- Basic$114 a year
- Pro$294 a year
- Credit Pack L$500, paid once
- Ultra$594 a year
RhymesLab
- FreeFree
- Free ForeverFree
- Spark$4.99, paid once
- Spark INK pack$4.99, paid once
- Flow$9.99 a month
- Surge$9.99, paid once
- Surge INK pack$9.99, paid once
- Pro$19.99 a month
- Fire$24.99, paid once
- Fire INK pack$24.99, paid once
In their own words
Lacuna
Lacuna turns a short idea into song lyrics and can send them to its music generator to create a track with AI vocals. The editor supports line-by-line rewrites, syllable counts, automatic rhyme highlighting, and rhyme suggestions ranked by meaning. It supports nine languages, with phonetic rhyme support for English, Spanish, Chinese, Japanese, and Korean. Automatic snapshots let users restore an earlier take after AI edits. Lacuna describes the workspace for songwriters, rappers, topliners, producers, and first-time writers, and says generated or edited lyrics may be recorded, released, and used commercially. The free plan provides 120 credits per month without requiring a credit card; each lyrics AI use costs five credits, and unused credits do not roll over. Pricing lists paid service from $9.50/mo (annual), while Basic is $19 a month. Audio downloads require a subscription, and credit packs alone do not include them. The developer API requires Pro or Ultra and uses credit-based billing. Lacuna lists web, iOS, extension, and API platforms.
RhymesLab
RhymesLab is a web-based lyrics editor for songwriters, with tools for rhyme, rhythm, drafting, rehearsal, and learning. It identifies perfect, slant, and assonance rhymes as lyrics are edited, and includes syllable counting, BPM tracking, a beat grid, and rhythmic analysis. The Ghost AI assistant can suggest or rewrite lines, find rhymes, and explain rhyme schemes and wordplay. Song Wizard creates a draft based on a selected theme, mood, and style. Teleprompter Mode scrolls lyrics for rehearsal, while the Academy offers interactive songwriting lessons. Explore helps writers discover songs shared by others, and Arena hosts challenges, voting, and leaderboards. The free plan allows five songs and 25 sections per month, 15 Ghost chats per day, and a 14-day Flow trial. Flow costs $9.99 a month; Pro is $19.99 a month and Studio is $39.99 a month. Pro and Studio include PDF export, with five and unlimited collaborators respectively. RhymesLab says users own their lyrics and their content is not used to train its AI models or shared with third parties. Its privacy policy also says data is encrypted in transit and at rest.