Best new tools this week (15 September 2026)

It was a broad, practical week on Tool Index, with 222 new listings approved across developer tools, AI utilities, productivity software, finance research, and interactive learning. The strongest entries stay close to real work, from tracing Claude Code costs to flashing STM32 firmware and running outbound calls.

The directory also added two useful reads for indie builders weighing a sale. Together they cover how small apps are valued and how escrow can keep the handover from becoming the riskiest part of the deal.

Tool of the week

MCUHex Flash STM32 firmware and monitor live variables from a browser

MCUHex flashes STM32 firmware and reads live variables over SWD from a browser based workflow. Its ELF symbol resolution, struct drill down, and waveform capture make embedded inspection unusually approachable without a full IDE.

Worth a look

CostClaw, Audit Claude Code token usage and workflow signals from local logs. It runs as a read only local audit, skips prompts, and reports cache misses, tool loops, model mix, and subagent spend.

Ringee, Open-source calling infrastructure for human teams and AI voice agents. The MIT licensed stack can be self hosted, supports calls to 180 plus countries, and exposes an MCP server for agent driven workflows.

Nowdex, Track AI coding usage and reset times across Apple devices. Widgets show remaining capacity and reset times on the Home Screen or Lock Screen, with credentials kept in the device Keychain.

Every new listing this week

222 new listings were approved since 8 September. The full set, newest first:

AI Tools List: Discover, compare, and explore the best AI tools in one place.
CostClaw: Audit Claude Code token usage and workflow signals from local logs
Ringee: Open-source calling infrastructure for human teams and AI voice agents
Nowdex: Track AI coding usage and reset times across Apple devices
reqlan: Keep linked, machine-readable software requirements beside the code
MCUHex: Flash STM32 firmware and monitor live variables from a browser
Karmit: Catch relevant Reddit threads early and track which replies earn karma
SuperOpt: Bring Linux and GNOME keyboard habits to macOS
Instabooks: Query QuickBooks Online data through a read-only PostgreSQL connection
Kario: Generate editable motion graphics from a brief, assets, or product URL
CleverCrow: Pool community funding on GitHub issues and pay maintainers when fixes merge
Oversold: Compare stock valuations, fundamentals, scenarios, and long-term trends
10k Science Viewer: Explore interactive 3D science lessons in a browser or Meta Quest
getdesign: Extract a website's visual system into a grounded design.md file
1Baton: Build reusable multi-step API tests without writing glue code
Sengi: Source and verify candidates for hard-to-fill roles inside an AI assistant
Makefaster: Let a coding agent test and keep measured website performance improvements
ClientCoded: Test and monitor conversational and data agents with adversarial scenarios and scored results
3DBAE: Build, render, and publish interactive 3D product experiences in a browser
Petrel: Turn booking emails, PDFs, and screenshots into one day-by-day travel itinerary
Tasfer: A local-first Canvas Markdown editor with rich blocks, LaTeX, and peer-to-peer sync
Vaaya: Controlled credit and pay-per-call services for AI agents
SaneHosts: Manage Mac hosts-file blocking with local profiles, curated lists, and Touch ID
Demorta: Record, edit, share, and measure interactive product demos from a Chrome extension
Vehla: A local-first macOS command center for AI, clipboard, windows, dictation, and notes
Replay: Find silent prompt cache breaks and explain what coding agent sessions cost
OmniPackage: Build and publish native Linux packages across distributions
StackRay: Inspect, compare, and track the technology behind websites
Lynen: Check clothing labels against independently tested fabric content
PDFidelity: Translate research PDFs while preserving columns, citations, tables, and formulas
Termique: Manage SSH hosts, terminals, files, and encrypted credentials across devices
Lab: Use multiple LLM providers from a local-first, serverless browser workspace
Lumae: Record and polish Mac product demos with local editing and agent controls
KyttoMCP: Manage MCP servers across popular AI coding clients from one local control panel
syntheticAIdata: Generate annotated synthetic image datasets for computer vision models
Viaduct: Maintain C4 architecture models that teams and coding agents can read
Billia: Create invoices and estimates in a browser, then download clean PDFs
Mostly Right: Build and maintain clean datasets for models that predict real-world events
Founder.best: Launch an indie product, collect community feedback, and keep a public product page
PressAudit: See how one news article fits into the wider coverage of its story
SnapPChart: Grade a trading setup from a chart screenshot before entering a trade
Stroq: Apply a local action firewall to AI coding agents and MCP tools
Pinch: Translate live conversations and recorded media while preserving each speaker's voice
Bee: Manage Google Calendar and Tasks by texting through iMessage or WhatsApp
SprytneOkazje.pl: Compare Amazon prices across Europe and spot genuine price drops
hcode One-Person Engineering: Run a structured software delivery lifecycle with several coding agents and one human owner
PromptSign: Sign and verify AI instruction files with traceable publisher identity
Rocky Surf: Create and manage isolated coding-agent VMs in cloud accounts you control
U Language: Compile a safety-focused programming language to portable C
ToText: Turn audio and video into editable transcripts, summaries, and subtitle files
ZestSSH: A private cross-platform SSH client with monitoring, automation, and encrypted sync
BuildYard.ai: Build a public portfolio around the AI workflows and skills you've actually shipped
CodePress: Run coding agents through shared cloud environments, QA, review, and team approvals
AI Manga Translator: Translate manga pages and full documents while preserving reading order and layout
codeset: Learn a subject through a complete syllabus and a project you choose
OnlinClipboard: Move text, images, and files between devices with temporary one-use shares
Papiers: Save, understand, search, and share research from papers, articles, and the web
OpenSAS: Run a tested subset of SAS 9.4 with an open-source local interpreter
GifRun: Turn video links and uploads into edited GIF or WebP clips in a browser
RDLTR: Save links from any device and clear them from an inbox-style reading queue

Fresh reading

This roundup goes out by email every Tuesday. Subscribe to get next week's in your inbox, or submit your tool to be in it.