Mermaid Online alternatives
These tools do a similar job to Mermaid Online. Prices, free plans and features below come from each vendor's own site.
| Mermaid Online | 3dlogoai | AI Undetectable | AllSubConverter | Any3D | Anyword | Article Forge | |
|---|---|---|---|---|---|---|---|
| Starting price | from $9.90/mo | No public price | from $5/mo | Free plan · from $4.16/mo | from $19.90/mo | from $39/mo | from $27/mo |
| Free plan | Not stated by the vendor | Not stated by the vendor | Not stated by the vendor | Yes | No | Not stated by the vendor | Not stated by the vendor |
| Free trial | Not stated by the vendor | Not stated by the vendor | Yes | No | Not stated by the vendor | Not stated by the vendor | Yes |
| Plans | Monthly package ($9.90/mo); One-time package ($19.90 once for 100 credits); Lifetime package ($99.90 once for lifetime access) | Starter Pack ($19 one-time for a 30-day pass; promotional price, was $29); Pro Pack ($29 one-time for a 30-day pass; promotional price, was $39) | 10K words ($9.99/mo, $5/mo annual, $60/yr); 20K words ($19/mo, $9.50/mo annual, $114/yr); 35K words ($31/mo, $15.75/mo annual, $189/yr) | Free ($0); 24-hour pass ($2.99 once for 24 hours; no auto-renewal); Monthly ($5.99/mo); Annual ($4.16/mo annual, $49.99/yr) | Starter ($19.90/mo); Standard ($34.90/mo); Premium ($69.90/mo) | Starter ($49/mo, $39/mo annual); Data-Driven ($99/mo, $79/mo annual); Business (Custom pricing); Enterprise (Custom pricing) | Standard ($57/mo, $27/mo annual) |
| Fees and pricing notes | $19.90 once for 100 credits; $99.90 once for lifetime access | $19 one-time for a 30-day pass; promotional price, was $29; $29 one-time for a 30-day pass; promotional price, was $39 | None stated | $2.99 once for 24 hours; no auto-renewal | None stated | None stated | None stated |
| Best for | Not stated | Creators, Agencies | Creators | Creators | Creators, Ecommerce | Not stated | Not stated |
| Key features | Live preview that renders the diagram as you type Mermaid syntax; Template library covering flowcharts, sequence, class, state, ER, user journey, Gantt and pie charts; Export as SVG or PNG, or copy the diagram or the Mermaid code; AI text-to-diagram and image-to-diagram generation, paid with credits | Logos in 3D or 2D from your company name or slogan, in under a minute; 11 design styles, from Retro 3D Serif to Pixel Art Game; Transparent-background PNG and WebP downloads, with upscaling to 2K and 4K; Font and text customization and revisions | AI text detector that estimates how machine-written a passage looks; Two rewrite modes: Basic and a deeper Stealth rebuild; Image detector for uploaded images or image links; Five writing modes: general, essays, articles, marketing copy and stories | Converts between 11 subtitle formats (including SRT, VTT, ASS, LRC, TTML, SCC, STL, SMI and SBV) plus YouTube JSON3, with 40+ conversion routes; Edit and clean tools: table editor, find and replace, line break balancing, language-aware cleaner; Sync tools: offset shift, drift calibration, speed scaling and frame rate conversion; Quality checks for reading speed, line length, overlaps and gaps, with a quality score | Turns a single photo or illustration into a 3D model; Interactive preview you can rotate and zoom before downloading; Download as a GLB file for further work in compatible 3D software; Settings for output resolution, texture size, mesh detail, optional remeshing, seed and steps | Unlimited copy generation; Performance predictions on every plan; 100+ marketing templates and prompts; Blog Wizard with a plagiarism checker | AI-written articles of 1,500+ words; Content that passes Copyscape; Automatic posting to blogs; Bulk article generation |
| Checked on | 2026-10-17 | 2026-10-11 | 2026-10-08 | 2026-10-17 | 2026-10-15 | 2026-10-03 | 2026-10-05 |
Prices change; confirm on the vendor's site before you buy.