Comparison

Thinklet vs STL Viewer

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

Thinklet

Features
Read full description

Thinklet is a powerful, privacy-friendly AI chat client for iOS. Connect it to any OpenAI-compatible API -- including OpenAI, Anthropic, Mistral, Groq, Ollama, and self-hosted models -- and start chatting in seconds. CONNECT ANY AI MODEL Add your own API key and Base URL. Thinklet works with any service that follows the OpenAI Chat Completions standard. Manage multiple platforms side by side, browse the full model list, and star your favorites for quick access. NATURAL VOICE CONVERSATION Press and hold the mic button to speak. Thinklet transcribes your words in real time and sends them the moment you lift your finger. Enable the speaker to have AI responses read aloud -- perfect for hands-free use. ATTACH IMAGES & FILES Pick a photo from your library or attach a text or PDF file directly to your message. Vision-capable models can analyze images; text files are embedded as context so the AI understands your documents. SMART SYSTEM PROMPTS Choose from built-in prompt templates -- General Assistant, Blog Writer, Code Expert, Translator, Academic Editor, Creative Writer -- or craft and save your own. Each conversation can have its own persona. PER-CONVERSATION PARAMETERS Fine-tune Temperature, Max Tokens, Top-P, and streaming mode for every chat independently. Add custom key-value parameters for advanced API features without touching a single line of code. MCP TOOL INTEGRATION Connect external tools and data sources via the Model Context Protocol (MCP). Enable web search, code execution, database queries, or any MCP-compatible service -- and assign different tools to different conversations. CLEAN, FOCUSED DESIGN A sidebar keeps all your conversations organized. Swipe right or tap the menu icon to open it. The minimal input bar stays out of your way until you need it. Dark mode and Dynamic Type are fully supported. YOUR DATA, YOUR CONTROL Thinklet stores everything -- conversations, settings, API keys -- locally on your device using iOS secure storage. No account, no cloud sync, no telemetry. Whether you are a developer experimenting with the latest models, a writer looking for a creative partner, or a professional who needs a capable AI assistant on the go, Thinklet gives you the flexibility and power you need, beautifully packaged for iPhone. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

STL Viewer

Features
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Someone sent you a model. It's a 3MF, you're away from your computer, and your phone can't open it. LayerPeek opens it, then tells you what you need to know before you print: will it fit your printer, how many plates it has, and what might go wrong. It's a 3D model viewer made for printing: an STL file viewer, a 3MF project viewer and a G-code layer viewer in one app. No account. Your files are read on your device and never uploaded. OPEN THE FILE YOU WERE SENT β€’ STL, 3MF, OBJ and G-code files, plus sliced .gcode.3mf projects β€’ ZIP downloads from model sites: pick the part you want from inside the archive β€’ Open from Files, iCloud Drive, Mail, AirDrop or a chat app with Open in… β€’ Large models are simplified for display, while measurements use the full mesh WILL IT FIT YOUR PRINTER? Pick your printer once. Every model you open shows whether it fits the bed, with the spare room in millimeters. If it doesn't fit as it sits, LayerPeek checks whether turning it on the bed would make it fit. 3MF PROJECTS, NOT JUST SHAPES Opens 3MF projects from popular slicers with their plates and filament colors. Switch between plates and see which parts sit on each one. SLICED FILES: TIME AND GRAMS FROM THE FILE Sliced .gcode.3mf projects already carry the numbers your slicer calculated. LayerPeek reads the print time, the grams of each filament color and the plate thumbnails straight from the file. Plain .gcode files show the print time and filament use written in their header. G-CODE LAYER VIEWER β€’ Drag the scrubber to step through the print layer by layer β€’ See extrusion and travel moves in different colors β€’ Print time and filament use, read from the file MEASURE AND CHECK THE MESH β€’ Overall dimensions in millimeters β€’ Tap two points to measure the distance between them β€’ Mesh health: holes and open edges that can cause slicing trouble β€’ Overhang shading shows the areas likely to need supports WEIGHT AND COST ESTIMATE Choose a material and your price per kilogram. For unsliced models, LayerPeek estimates a typical print (2 walls, 15% infill) and also shows the fully solid weight. Sliced files show the grams your slicer calculated. MAKE PARTS THAT FIT Need a part rather than a file? Pick a template, set the sizes in millimeters, see it on your printer's bed and save an STL or 3MF: β€’ Cases for popular microcontroller and single-board computer boards, built from their published dimensions β€’ Boxes with dividers, name tags in one or two colors, cable clips, spacers and wall mounts β€’ Turn a photo into a lithophane, a keychain, a sign or a stamp SHARE A VERDICT CARD Turn the result into one image with a picture of the model, the fit check and the key numbers. Send it to a friend, a customer or your print group. FREE, WITH AN OPTIONAL PRO UPGRADE LayerPeek is free with ads. Pro removes the ads and unlocks the Pro Make templates, pricing a plate with cost and margin, advanced checks with multiple printers, and more colors in colour pictures. SUPPORTED FILES .stl (binary and text) Β· .3mf Β· .gcode.3mf Β· .obj Β· .gcode Β· .zip SUBSCRIPTION AND PRICING β€’ LayerPeek Pro Lifetime β€” $9.99, one payment β€’ LayerPeek Pro Monthly β€” $1.99 per month, renews automatically β€’ Payment is charged to your Apple Account at confirmation of purchase β€’ A subscription renews unless it is cancelled at least 24 hours before the end of the current period β€’ Manage or cancel anytime in your Apple Account settings Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://cosmovex.web.app/apps/layerpeek/privacy-policy

Screenshots

Thinklet4 screens
STL Viewer4 screens

Verdict

The call

The clearest difference is ads: Thinklet at none against STL Viewer's shown. STL Viewer's advantage is update cadence (fortnightly vs every 2 months) and iOS requirement (15.0 vs 26.2). On price, in-app purchases and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Thinklet sells 4 in-app purchases, starting at $4.99 per month and STL Viewer sells 8 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Thinklet ships an update every 2 months, STL Viewer fortnightly. Both last shipped on October 24, 2026.

Scorecard3 real differences Β· 3 level
Thinklet versus STL Viewer: the parameters behind the verdict, then further details
ParameterThinkletSTL Viewer
PriceFreeFree
Update frequencyEvery 2 monthsFortnightly β€” better
AdsNo β€” betterYes
In-app purchasesYesYes
DevicesiPhone, iPadiPhone, iPad, iPod β€” better
Requires iOS26.215.0 β€” better
Further details β€” not scored
Size8 MB48 MB
Age rating4+4+
Developerζ΄‹ εΌ Sahana A S

In-app purchases

4 purchases

Thinklet

Subscriptions4
  • Starter$4.991 Month
  • Basic$9.991 Month
  • Pro$19.991 Month
Show 1 more
  • Max$49.991 Month
8 purchases

STL Viewer

Subscriptions1
  • LayerPeek Pro Monthly$1.991 Month
One-time7
  • Pro Lifetime Limited Offer$5.99
  • Pro Lifetime Limited Offer$7.99
  • Pro Lifetime Limited Offer$9.99
Show 4 more
  • Pro Lifetime Limited Offer$11.99
  • Pro Lifetime Limited Offer$13.99
  • Pro Lifetime Limited Offer$15.99
  • LayerPeek Pro Lifetime$19.99

Questions

Is Thinklet free?
Thinklet is free to download, with in-app purchases available.
Is STL Viewer free?
STL Viewer is free to download, with in-app purchases available.
Do Thinklet or STL Viewer have ads?
STL Viewer shows ads; Thinklet does not.
Which is updated more often, Thinklet or STL Viewer?
Thinklet ships an update every 2 months, and STL Viewer fortnightly. Most recently, Thinklet was updated on October 24, 2026 and STL Viewer on October 24, 2026.

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