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Smartmockups VS Sinatra.dev

Compare Smartmockups VS Sinatra.dev and see what are their differences

Smartmockups

Create stunning product mockups, easily and online.

Rating
0 reviews
Pricing
Freemium Free trial $14 / Monthly (PRO)
Alternatives Is it good?
Sinatra.dev

A background coding agent for your backlog. Assign a Linear issue, label a GitHub issue or mention it in a Slack thread; it writes the change in an isolated sandbox, runs your tests and opens a pull request. Free: 1 task at a time, plus 1 queued.

Rating
0 reviews
Pricing
Freemium $20 / Monthly (Per workspace, any number of people)
Alternatives Is it good?
KeptPDF
Redact, edit, OCR, and sign PDFs entirely in your browser. The file never leaves your device. Free, no account needed. sponsored
Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Which is more popular?

Based on our record, Smartmockups seems to be more popular. It has been mentioned 15 times since March 2021.

social mentions
15 vs 0
Design Tools popularity
100% vs 0%
alternatives listed
240+ vs 9

Base details

Website, pricing, platforms and company facts side by side.

Smartmockups
Sinatra.dev
Website smartmockups.com sinatra.dev
Pricing
Freemium Free trial $14 / Monthly (PRO) Official pricing
Freemium $20 / Monthly (Per workspace, any number of people) Official pricing
Platforms
Web
—
Company Startup from the Czech Republic —
Listed in
Design Tools Development Prototyping Mockups Web Development Tools +2
AI Coding AI Developer Tools Developer Tools AI Coding AI Agents AI Tools +4

About Smartmockups and Sinatra.dev

In their own words, as submitted to SaaSHub.

Smartmockups
Sinatra.dev

Smartmockups helps people and businesses the world over create engaging visual materials. Our online mockup tool features a stellar mockup library, intuitive design tools, and is available anywhere, anytime. Smartmockups is the easiest way to showcase your designs on real-world products.

Read more about Smartmockups

Sinatra is a background coding agent for teams on Linear, GitHub and Slack. Assign a Linear issue to Sinatra, add the sinatraai label to a GitHub issue, or mention @Sinatra in a Slack thread, and it works the request in an isolated cloud sandbox: it reads the code, writes the change, runs your...

Read more about Sinatra.dev

Features and specs

What each product offers, as listed by its team.

Smartmockups 9 features
Sinatra.dev 6 features
  • Access to all mockups
    Entire 8000+ exclusive mockup library
  • Advanced features
    Change the background or customize the main object (T-shirt color, mug style, device color, etc.)
  • URL screenshots
    Upload an URL address and get the screenshot of the website to use in your mockup design
  • Unlimited mockup export
    No mockup download limits. Export and share as many mockups as you want, in super high resolution
  • Transparent PNG export
    Download your mockup with a transparent background
  • Video mockups
    Upload a video or GIF to any technology or social media mockup
  • Custom mockups
    Turn your own photos into easy-to-use mockups.
  • Your branding
    Save your brand colors and add your logo as a watermark
  • Custom background feature
    Upload your custom photo or color to isolated mockups to create your own background
  • Linear, GitHub and Slack
    Assign a Linear issue to Sinatra, add the sinatraai label to a GitHub issue, or mention @Sinatra in a Slack channel. In Slack it works in that thread and posts its progress there.
  • Isolated sandbox per task
    Each task gets its own cloud sandbox with your repo cloned in, behind an audited egress proxy with short-lived, scoped repo tokens.
  • Tests and self-review
    It runs your test command and reviews its own diff before marking the pull request ready for you.
  • Fixes CI and review feedback
    When CI fails or a reviewer requests changes, it pushes fixes to the same branch. A human always merges.
  • Your own model access
    Runs on your Claude or ChatGPT subscription, or an Anthropic or OpenRouter API key. Sinatra never bills for model usage.
  • CLI, MCP server and API
    Start and follow tasks from your terminal (npm i -g sinatra.dev), from claude.ai, Claude Code, Cursor or ChatGPT over MCP, or from a script with the HTTP API.

Analysis

An editorial look at what each product does well and who it suits.

Smartmockups
Sinatra.dev

Overall verdict

  • Overall, Smartmockups is a valuable tool for anyone looking to create professional mockups with minimal effort. Its intuitive interface and wide range of templates make it a popular choice among designers and marketers. However, its usefulness depends on individual needs, such as the specific types of devices or products you need mockups for.

Why this product is good

  • Smartmockups is considered good because it offers an easy-to-use platform for creating high-quality mockups quickly and efficiently. It provides a comprehensive library of templates and allows users to customize mockups for various devices and products without needing advanced design skills. The platform integrates with popular design tools like Canva, Figma, and Adobe Creative Cloud, enhancing its utility for designers and marketers alike.

Recommended for

  • Graphic Designers
  • Marketing Professionals
  • Entrepreneurs
  • E-commerce Sellers
  • Social Media Managers

No analysis of Sinatra.dev yet.

Videos

Walkthroughs and reviews on video.

Smartmockups 6 videos + Add
Sinatra.dev 2 videos + Add

Smartmockups Review | Create Product Mockups

More videos

  • - SMARTMOCKUPS FOR YOUR T SHIRT BUSINESS | How To Use A Free Online Mockup Generator To Create Mockups
  • - SmartMockUps Review 2019'
  • - How to group mockups into collections
  • - Introducing Custom mockup editor 2.0 in Smartmockups
  • - How to get started with Smartmockups

Sinatra demo: GitHub issue to pull request, end to end (22 seconds)

More videos

  • - Sinatra demo: Linear issue to pull request (21 seconds)

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
Smartmockups
Sinatra.dev
100% 100%
Design Tools
0% 0%
0% 0%
Developer Tools
100% 100%
100% 100%
Mockups
0% 0%
0% 0%
AI Developer Tools
100% 100%

Questions & Answers

As answered by people managing Smartmockups and Sinatra.dev.

How would you describe the primary audience of your product?

Sinatra.dev's answer:

Small engineering teams and solo founders with a backlog of well specified tickets they never get to: reproducible bugs, small features with acceptance criteria, the work that is clear enough to hand off but keeps getting pushed behind bigger things. Teams already working out of Linear, GitHub Issues or Slack who don't want another tool to learn, and who would rather run agent work on the Claude or ChatGPT subscription they already have than open a new metered account somewhere else.

What's the story behind your product?

Sinatra.dev's answer:

I built a pet sitting marketplace with my wife. She always had features she wanted shipped and every one of them went through me, so I spent about three months building an agent she could assign tickets to instead. She writes the ticket, assigns it, and a PR comes back. She's now a big contributor to that codebase without me being in the way. I started handing it my own backlog too and eventually it turned into a product. It has been a lot harder to build than I expected, lots of edge cases, which is why it started with just Linear and GitHub issues (Slack, a CLI and an MCP server came later) and why the agent doesn't merge its own PRs, you still do that last part yourself.

Which are the primary technologies used for building your product?

Sinatra.dev's answer:

TypeScript throughout. A Fastify API for webhooks and OAuth, a Temporal worker that orchestrates each agent run, Next.js for the dashboard and the site, and Prisma on Postgres. Every task gets its own Daytona sandbox with the repository cloned in; the sandbox stops when the task goes quiet and is reused for follow-ups. Model access is bring your own: an Anthropic or OpenRouter API key, or a Claude or ChatGPT subscription connected to the workspace.

What makes your product unique?

Sinatra.dev's answer:

It runs on the model subscription you already pay for. You assign a Linear issue, label a GitHub issue or mention it in Slack, the agent does the work in its own isolated sandbox and comes back with a pull request, and the model bill goes to your own Claude or ChatGPT subscription or API key. Sinatra never bills for model usage. The free plan is 1 task at a time, plus 1 queued, with no daily limit and no card. Pricing was the reason we built it in the first place, the agents we tried billed in credits you couldn't predict.

Why should a person choose your product over its competitors?

Sinatra.dev's answer:

Pricing and entry points. Plans are one flat monthly price for the whole workspace, any number of people: Pro is $20/mo for 3 tasks at a time, plus 10 queued, and inference runs on your own Claude or ChatGPT subscription or API key, so Sinatra never bills for model usage. And it works from Linear issues, GitHub issues and Slack threads, so a team whose tickets live in Linear can assign work to the agent the way they'd assign a teammate. It also reviews its own diff and posts the findings on the PR, fixes failing CI, and pushes revisions when a reviewer leaves comments. To be honest about the limits, it doesn't work from Jira, and the agent never merges its own PRs, a person does that.

User comments

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Social recommendations and mentions

Recommendations tracked on public social media and blogs since March 2021.

Smartmockups 15 mentions
Sinatra.dev 0 mentions
  • The Best 100 Free UI/UX Resources for Every Designer & Developer
    Smartmockups Smartmockups.com Free device and apparel mockup generator. - Source: dev.to / over 1 year ago
  • First logo after learning illustrator over the past couple of weeks. Please be blunt and recommend some colors! (sorry I do not know how to mock it up)
    I use smartmockups.com. Just upload your PNG with transparent background. Source: about 3 years ago
  • Using produt photos from another website
    By the way, there are sites with free mockup images, https://smartmockups.com/ is one example. Source: over 3 years ago

View more

Tracking Sinatra.dev since Sep 2026.

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