Tools for building ambitious startups

Sensor Tower is a market intelligence platform that tracks mobile app downloads, revenue, usage, and digital advertising across iOS, Android, and the web. Teams use it for competitive benchmarking and user acquisition decisions.

Sentry is an application monitoring and error tracking platform that captures errors, performance traces, logs, and session replays so developers can find and fix issues in real time. It supports a wide range of languages and frameworks.

Alternative toDatadog|Rollbar|Bugsnag

Keyword.com (formerly Serpbook) is a search visibility platform that tracks Google rankings, AI Overviews, and brand presence across AI search engines, with SERP analytics and client reporting. It is priced per keyword for agencies and in-house SEO teams.

Alternative toSemrush|Ahrefs|AccuRanker

Serpstat is an SEO platform offering keyword research, competitor analysis, rank tracking, site audits, and keyword clustering. It also sells API access to its SEO data.

Alternative toSemrush|Ahrefs|MMoz

SERPwatcher is a keyword rank tracking tool, part of the Mangools SEO suite, that monitors daily Google positions and summarizes performance with a single index score. It includes scheduled reports and change alerts.

Alternative toAccuRanker|NNightwatch|SE Ranking

Shake is a bug and crash reporting SDK that captures detailed context, screenshots, and video when users report issues in mobile and web apps. It includes session replay, AI-assisted debugging, and ticket management.

Alternative toBugsnag|Sentry|Instabug

Shakr is a video creation and versioning platform that lets businesses produce video ads and marketing videos at scale using templates and automation. It is aimed at advertisers needing many creative variations.

Alternative toIInVideo|PPlainly|Animoto

Sheet2Site turns a Google Sheet into a live website with images, filters, and links, no coding required. Updates to the spreadsheet are reflected on the site in real time.

Sheetgo connects spreadsheets, CSV files, databases, and other sources into automated data workflows, transferring and consolidating data on a schedule. It can also generate documents, PDFs, and emails from spreadsheet data.

Shopify is a hosted e-commerce platform for building online stores and selling across web, social, and in person. It offers a large app ecosystem, payments, and REST and GraphQL APIs.

Shoutem is a no-code app builder, built on React Native, that lets users create and publish cross-platform mobile apps for iOS and Android. It includes push notifications, third-party integrations, and live streaming.

Alternative toFFlutterFlow|APAppy Pie|GoodBarber

Shower is an open source presentation engine built with HTML, CSS, and vanilla JavaScript that runs in any modern browser. Themes are separate from the engine, and presentations are keyboard accessible and printable to PDF.

Shubox is a JavaScript library and service for uploading files and images directly from a web app to Amazon S3, with built-in image transformation, optimization, and format conversion. It is built on top of Dropzone.js.

Alternative toUploadcare|Filestack|CCloudinary

Siftery was a database of the software and services companies use, letting users explore tech stacks of peer companies and find product alternatives. It was acquired by G2 in 2018.

SimilarWeb is a digital intelligence platform that measures website and app traffic, audience behavior, and competitor performance for market research and competitive analysis.

Alternative toSemrush|Ahrefs|SE Ranking

Simplenote is a lightweight, free note-taking app with real-time syncing, tags, version history, and Markdown support across devices.

Alternative toEEvernote|Notion|GKGoogle Keep

SISTRIX is an SEO toolbox for tracking visibility and keyword rankings, analyzing competitors, fixing technical on-page issues, and optimizing content across Google, Amazon, and social platforms.

Alternative toSemrush|Ahrefs|SimilarWeb

Sketch is a native macOS design toolkit for vector editing, prototyping, real-time collaboration, component libraries, and developer handoff.

Alternative toFigma|AXAdobe XD|AIAdobe Illustrator

Slack is a team collaboration platform built around channels, messaging, huddles, file sharing, and AI agents, with workflow automation and deep integrations into business tools.

Alternative toMTMicrosoft Teams|Discord|GCGoogle Chat

SlideCamp is a PowerPoint add-in that gives teams a centralized, searchable slide library and auto-syncs updates across presentations to keep decks on-brand.

Alternative toTTemplafy|PAPlus AI|Beautiful.ai

Slimvoice was a minimalist invoicing app for freelancers and small businesses. The service shut down on April 1, 2023 and all user data was deleted.

Alternative toINInvoice Ninja|FreshBooks|Wave

Small.chat adds a customer chat widget to your website and routes conversations into Slack so teams can reply to visitors without leaving Slack.

Alternative toIntercom|Crisp|Tidio

Smartlook is a qualitative analytics platform for websites and mobile apps offering session recordings, event tracking, funnels, heatmaps, and crash reports. The product reached end of sale on May 31, 2026.

Alternative toHotjar|FullStory|MCMicrosoft Clarity

Smile.io lets ecommerce merchants build customer loyalty programs with points, rewards, referrals, and VIP tiers to drive repeat purchases and lifetime value.