Software Alternatives & Startups

quackr VS FFSIM

Compare quackr VS FFSIM and see what are their differences

quackr

Temporary Phone Numbers & Virtual Numbers for SMS Verification

Rating
0 reviews
Pricing
Open source Freemium $12.99 / Usage
FFSIM

Get Global Virtual Phone Numbers for SMS Verification with Non-VoIP and VoIP Options. Best temporary phone number service.

Rating
0 reviews
Pricing
Paid Free trial $0.02 / Monthly (.20)
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, quackr seems to be more popular. It has been mentioned 49 times since March 2021.

social mentions
49 vs 0
Temporary Phone Numbers popularity
100% vs 0%
alternatives listed
56 vs 16

Base details

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

quackr
FFSIM
Website quackr.io ffsim.com
Pricing
Open source Freemium $12.99 / Usage Official pricing
Paid Free trial $0.02 / Monthly (.20) Official pricing
Platforms —
Web
Company Startup from the United Kingdom Startup from the United States · 2026
Listed in

About quackr and FFSIM

In their own words, as submitted to SaaSHub.

quackr
FFSIM

Quackr provides temporary phone numbers, temp numbers, and virtual numbers to receive SMS verification online without a physical SIM card.

Read more about quackr

FFSIM – Global Virtual Phone Numbers for SMS Verification FFSIM is an online platform providing Non-VoIP and VoIP virtual phone numbers for SMS verification across multiple countries. It offers an affordable and convenient solution for online registrations, OTP verification, and supported digital...

Read more about FFSIM

Features and specs

What each product offers, as listed by its team.

quackr 3 features
FFSIM 8 features
  • Temporary Phone Numbers
    Rent a temporary phone number to receive SMS verification codes online.
  • Receive SMS Online
    Receive SMS messages instantly for OTPs, 2FA, and account verification.
  • Receive Only Service
    Quackr is designed to receive SMS only no calls or outbound messages.

Possible disadvantages

  • Limited Usage
    Because these are temporary numbers, they may not work for receiving important or long-term communication, as the number might expire or be reused by someone else.
  • Service Compatibility
    Not all services accept temporary phone numbers for verification, which can limit the use of Quackr for certain websites or applications.
  • Potential Overuse
    Popular temporary numbers might receive a lot of verification codes or messages, which can become overwhelming and result in missed messages intended for the user.
  • Non-VoIP Numbers
    Real Non-VoIP virtual phone numbers for SMS verification.
  • VoIP Numbers
    Access VoIP numbers for supported SMS verification services.
  • Same Number Renewal
    Renew the same previously purchased phone number multiple times.
  • Instant SMS Delivery
    Receive OTP and verification messages online.
  • Pay only for success
    Pay only when a successful verification meets the service conditions.
  • Affordable Pricing
    Competitive pricing for different countries and number types.
  • Multiple Services
    Supports over 1,435 services and platforms.
  • User-Friendly Dashboard
    Easily manage numbers, purchases, and SMS verification.

Analysis

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

quackr
FFSIM

Overall verdict

  • Quackr is considered a good service for individuals seeking a simple and efficient solution to avoid using their personal phone number for verification purposes. However, the effectiveness and reliability can vary based on location and service needs.

Why this product is good

  • Quackr is generally well-regarded for its ability to provide temporary phone numbers for SMS verification, which helps users maintain privacy and security when interacting with online services that require phone number verification. It offers a straightforward platform that is easy to use and supports multiple international numbers, making it versatile for users across the globe.

Recommended for

    Quackr is recommended for users who prioritize their privacy by not sharing personal phone numbers, frequent digital nomads engaged with international services, and anyone attempting to bypass SMS verification without a personal or permanent number.

No analysis of FFSIM yet.

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
quackr
FFSIM
100% 100%
0% 0%
0% 0%
100% 100%
100% 100%
0% 0%
0% 0%
100% 100%

Questions & Answers

As answered by people managing quackr and FFSIM.

What makes your product unique?

quackr's answer

Quackr stands out by offering a seamless bridge between free public access and premium private security. Unlike many competitors that rely solely on low quality VoIP numbers (which are often blocked), Quackr provides Private Non-VoIP Numbers sourced from real SIM cards. This ensures high deliverability rates for strict services like Tinder, Gmail, and Banking apps, giving users a level of reliability that standard free sites cannot match.

FFSIM's answer:

FFSIM stands out with its Repeat Number Renewal feature, allowing users to keep and renew the exact same physical SIM phone number multiple times for ongoing SMS verification. Unlike typical temporary number services, FFSIM offers real Non-VoIP numbers, global coverage across multiple countries, instant SMS delivery, and a pay-only-for-success pricing model. Users also benefit from an easy-to-use dashboard, competitive pricing, and access to over 1,435 supported services.

Which are the primary technologies used for building your product?

quackr's answer

Quackr is built on a robust cloud infrastructure designed for speed and security. We utilize advanced telecommunications APIs to bridge real world SIM networks with our digital dashboard, ensuring near instant SMS delivery. Our frontend uses modern frameworks (like React/Next.js) to ensure a fast, responsive experience on both mobile and desktop.

FFSIM's answer:

FFSIM is built as a web-based platform featuring automated SMS verification workflows, real-time message delivery, number management, and an integrated payment system. Its platform includes automated number allocation, SMS monitoring, user account management, and repeat number renewal functionality. These technologies work together to provide users with a convenient and streamlined verification experience.

What's the story behind your product?

quackr's answer

Quackr started with a simple mission to stop SMS spam. We realized that requiring a personal phone number for every minor sign-up was a privacy risk. What began as a free tool to protect users from telemarketers has evolved into a comprehensive privacy platform, helping thousands of users globally verify accounts securely without exposing their real identity.

FFSIM's answer:

FFSIM was created to make online SMS verification simpler, more accessible, and affordable. The platform focuses on solving common problems with temporary phone number services, including limited number availability, unreliable SMS delivery, and the inconvenience of repeatedly purchasing new numbers. FFSIM introduced a repeat number renewal solution that allows users to keep using the same physical SIM number for supported services. Its mission is to provide convenient, reliable, and affordable virtual phone number solutions worldwide.

How would you describe the primary audience of your product?

quackr's answer

Our primary audience consists of privacy conscious professionals, digital marketers, and cybersecurity enthusiasts. This includes social media managers managing multiple accounts, developers testing authentication flows, and individuals who want to secure their personal data against data breaches. They are users who value their digital footprint and are willing to invest in secure, private verification methods.

FFSIM's answer:

FFSIM is designed for individuals, developers, software testers, digital professionals, and businesses that need virtual phone numbers for legitimate SMS verification and testing purposes. It is particularly useful for users who need Non-VoIP numbers, international phone number options, repeated verification access, and affordable SMS verification solutions.

Why should a person choose your product over its competitors?

quackr's answer

Competitors often provide recycled, spam filled numbers that fail verification checks. Users choose Quackr because we offer guaranteed privacy. With our paid rental option, users get a dedicated number that is theirs alone no shared messages, no interference. We combine the ease of a "one click" free service with the professional reliability of a paid private line, giving users the best of both worlds.

FFSIM's answer:

FFSIM offers several advantages, including real Non-VoIP physical SIM numbers, repeat number renewal, competitive pricing, and automated SMS delivery. Users can renew their existing numbers instead of purchasing new ones whenever renewal is supported. FFSIM also follows a pay-only-for-success policy, meaning users are not charged when a verification code is not received. Its simple dashboard and wide range of supported services make SMS verification convenient.

Who are some of the biggest customers of your product?

FFSIM's answer:

FFSIM serves a diverse international user base, including:

  • Individual users looking for virtual phone numbers for SMS verification.
  • Software developers and application testers.
  • Digital professionals and online entrepreneurs.
  • Businesses requiring SMS verification solutions.
  • Users who need repeat number renewal for supported services.

FFSIM currently serves over 1,700 users through its online platform.

User comments

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

Log in or Post with

Social recommendations and mentions

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

quackr 49 mentions
FFSIM 0 mentions
  • Ask HN: Is there a temp phone number like temp email?
    There are lots of them: https://quackr.io/ https://receive-smss.com/ https://sms24.me/ https://temp-number.com/ https://onlinesim.io/. - Source: Hacker News / about 1 year ago
  • Did people really use "burner phones"?
    I'm also curious because it seems like using a phone with no strings attached today seems almost impossible unless you get an actually old phone, which either works poorly or costs a lot as part of a retro collection or something. Even... Source: about 3 years ago
  • I'm back and the chair has never been stronger.
    You can also take this poll over at bettor edge, and whichever team gets the most votes, will get an extra 5k donated to their respective charity (the loser will still get a 1k donation). So if you are so inclined, head over there and... Source: about 3 years ago

View more

Tracking FFSIM since Nov 2026.

Alternatives to quackr and FFSIM

When comparing quackr and FFSIM, you can also consider the following products.

  • SMS-man.com

    SMS-man offers a virtual numbers to receive SMS and create multiple accounts on WhatsApp, Telegram, Instagram, Twitter, Amazon and others. The SMS-man service provides numbers of such countries as China, US, India, Russia, UK, Germany, Ukraine etc.

    Compare SMS-man.com to quackr or FFSIM:

  • Smspva

    The best SMS activation site! Operating since 2013. Payment by card. 60+ countries numbers. Purchase without registration!

    Compare Smspva to quackr or FFSIM:

  • HeroSMS

    Receive SMS online to virtual numbers — use directly on site or via API to register accounts of any service and application, receive profits and discounts

    Compare HeroSMS to quackr or FFSIM:

  • AnonymSMS

    Totally free online service whereby you can Receive SMS Online, without the need of inputting your own mobile/cell number.

    Compare AnonymSMS to quackr or FFSIM:

  • flo-voice1.com

    Instantly rent a phone number to receive SMS verification codes for popular services. Earn 80% commission as a partner.

    Compare flo-voice1.com to quackr or FFSIM:

  • GlowSMS

    Temporary non-VoIP phone numbers for receiving SMS and OTP verification codes online, with activations lasting up to 20 minutes across 180+ countries and 500+ supported services.

    Compare GlowSMS to quackr or FFSIM: