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LSD VS Firenum

Compare LSD VS Firenum and see what are their differences

LSD

Read your emails using SQL

No screenshot yet
Rating
0 reviews
Pricing
Open source
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Alternatives Is it good?
Firenum

Calculate your path to financial independence

Rating
0 reviews
Pricing
Free
Promote on VibeVoted
Alternatives Is it good?
ZeroTwo AI
ZeroTwo is a premium multi-provider AI platform which combines the tools models and features of Claude, Gemini, Grok, Openai and more into one. Canvas, Deep Research, MCP, Connectors, Agents, Projects and even Apps are all available in one place! 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, LSD seems to be more popular. It has been mentioned 2 times since March 2021.

social mentions
2 vs 0
CRM popularity
100% vs 0%
alternatives listed
4 vs 25

Base details

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

LSD
Firenum
Website lsd.so firenum.com
Pricing
Open source
Free
Platforms —
Web
Company — Startup from the United States · 1 - 9 employees · 2019
Listed in
Chatbots CRM Chatbot Platforms & Tools AI +1
Finance Personal Finance Retirement Financial Planner Finance Calculators +2

About LSD and Firenum

In their own words, as submitted to SaaSHub.

LSD
Firenum

No description of LSD yet.

Free FIRE calculator suite for planning early retirement. Calculate your FIRE number, Coast FIRE, Lean/Fat/Barista FIRE, project retirement dates, and track net worth with the Progress Tracker. Project your journey twoards FIRe on a dashboard. Model market crash scenarios and other events....

Read more about Firenum

Features and specs

What each product offers, as listed by its team.

LSD 0 features
Firenum 5 features

No features have been listed yet.

  • Virtual Phone Numbers
    Firenum provides virtual phone numbers that allow users to make and receive calls without needing a traditional phone line or SIM card, offering flexibility for personal and business use.
  • Privacy Protection
    Users can keep their personal phone number private by using a Firenum virtual number for online registrations, business contacts, or other scenarios where sharing a real number may be undesirable.
  • Multiple Numbers on One Device
    Firenum allows users to manage multiple phone numbers on a single device, which is convenient for separating work and personal communications without carrying multiple phones.
  • International Number Availability
    The service offers phone numbers from various countries, making it useful for businesses or individuals who need a local presence in different regions without physical offices.
  • Easy Setup
    Firenum provides a relatively straightforward setup process, allowing users to quickly obtain and start using a virtual phone number without complex configurations or hardware requirements.

Analysis

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

LSD
Firenum

Overall verdict

  • LSD (lsd.so) is a solid, modern tool for developers looking to work with data and APIs through a declarative, SQL-like language, offering a clean approach to querying and integrating multiple data sources.

Why this product is good

  • Provides a declarative, SQL-inspired language that simplifies querying across diverse data sources
  • Lets developers connect and integrate multiple APIs and databases without heavy boilerplate code
  • Focuses on a modern developer experience with clean syntax and composability
  • Reduces the need for custom glue code when working with external services

Recommended for

  • Developers who frequently integrate multiple APIs and data sources
  • Teams building data pipelines or internal tooling that need a unified query layer
  • Engineers who prefer a declarative, SQL-like approach over writing imperative integration code
  • Startups and small teams looking to prototype data-driven applications quickly

Overall verdict

  • Firenum is a budget-friendly online SMS verification service that provides temporary and virtual phone numbers for receiving one-time verification codes, making it a practical choice for users who need to register on platforms without exposing their personal phone number.

Why this product is good

  • Offers virtual numbers from multiple countries for SMS verification
  • Pay-as-you-go pricing that is generally cheaper than buying a physical SIM card
  • Fast delivery of verification codes for most supported services
  • Simple web interface that doesn't require app installation
  • Useful for protecting personal privacy when signing up for online services

Recommended for

  • Users who need one-time SMS verification for apps or websites
  • People who want to avoid sharing personal phone numbers online
  • Developers or testers who need multiple numbers for account creation testing
  • Individuals in regions where certain services require a local number
  • Privacy-conscious users looking for temporary phone number solutions

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
LSD
Firenum
100% 100%
CRM
0% 0%
0% 0%
Retirement
100% 100%
100% 100%
Chatbots
0% 0%
0% 0%
Personal Finance
100% 100%

Questions & Answers

As answered by people managing LSD and Firenum.

What's the story behind your product?

Firenum's answer:

Firenum started as a single FIRE number calculator ("fire + num = your number") and grew into a full planner. The aim was to make FIRE planning free and private, and to say honestly when a fee-only advisor is worth paying for.

What makes your product unique?

Firenum's answer:

Firenum plans your finances month by month and runs entirely in your browser, with no account and no signup. Your plan is stored on your own device, not on our servers. You get Monte Carlo simulation, historical backtesting against every period since 1871, and six stress scenarios (market crash, lower returns, job loss, expense spike, high inflation, retiring earlier or later), all for free. It supports 9 currencies with local number formatting, including lakh/crore for rupees and 万/億 for yen.

Why should a person choose your product over its competitors?

Firenum's answer:

Paid planners like ProjectionLab and Boldin keep features such as saving your plan or advanced drawdown modelling behind a subscription. Firenum includes all of it free, with no account. Choose it if you want serious FIRE planning without handing your financial details to a company, or if you plan in a currency other than USD. If you need detailed US tax modelling or Roth conversion planning, a paid tool may still suit you better.

How would you describe the primary audience of your product?

Firenum's answer:

People working towards financial independence and early retirement (FIRE), from those who've just learned the 4% rule to those checking a drawdown plan before quitting. Many users are outside the US and want a planner that isn't built around US assumptions.

Which are the primary technologies used for building your product?

Firenum's answer:

Astro, Preact with Preact Signals, TypeScript, Chart.js, Web Workers (simulations run off the main thread), Cloudflare Workers for hosting, and Playwright for end-to-end tests. The backtesting uses Robert Shiller's historical S&P 500 data.

Who are some of the biggest customers of your product?

Firenum's answer:

Individual FIRE planners worldwide (no accounts, no data collected)

User comments

Share your experience with using LSD and Firenum. For example, how are they different and which one is better?

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Social recommendations and mentions

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

LSD 2 mentions
Firenum 0 mentions
  • Show HN: Gave Claude LSD SQL
    LSD SQL is a DSL for the web that can self-correct as an LLM traverses the internet. Here's what it looks like now that Claude is connected to the internet similar to OpenAI's Deep Researcher. Want to be a Claudestine Chemist? Follow the... - Source: Hacker News / over 1 year ago
  • ForgeML – LSD example to use LLMs with deterministic web data
    With Forge, your AI agent can get structured data from the internet within application workflows. As LSD Aliases grow (or AI and AI agent developers use LSD Bicycle to flag relevant aliases they need to access structured internet data... - Source: Hacker News / about 2 years ago

Tracking Firenum since Feb 2026.

Alternatives to LSD and Firenum

When comparing LSD and Firenum, you can also consider the following products.

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