What I noticed immediately was the sturdiness of the Pro's build. It feels more robust, which makes sense given it integrates a larger battery and upgraded secure chip (or secure element, as I prefer to call it). If you favor discreet daily carry, the S is ultra-portable. But if you value durability and expect heavy usage, the Pro’s sturdier shell might appeal more.
In terms of setup, both wallets follow similar steps involving pairing with the companion mobile app, creating a seed phrase, and setting a PIN. Neither presents an overwhelming learning curve for users familiar with hardware wallets—or those willing to spend a bit of time learning.
Design and Portability
The CoolWallet S’s credit-card form factor is a unique selling point. Because it’s thin and light, I found it convenient during daily use—especially when traveling or commuting with a physical wallet.
The Pro, while still portable, loses some of this seamlessness. It’s slightly heftier due to added features like extended battery life and a redesigned secure element architecture, which I’ll touch on below.
Given my experience, here’s the quick rundown:
| Feature |
CoolWallet S |
CoolWallet Pro |
| Size |
Credit-card thin and light |
Slightly thicker, more robust |
| Battery life |
About 1 week on normal use |
Up to 2 weeks, depending on usage |
| Display |
E-ink screen, single color |
E-ink screen with improved contrast |
For those who prioritize everyday carryability, the S wins. For heavier users, or those who want fewer charges, the Pro’s battery improvement is worth considering.
Security Architecture
Here’s where the real technical differences begin to matter. Both wallets employ a secure element—an isolated chip designed to store private keys securely and sign transactions internally. This is a non-negotiable feature for hardware wallets aiming for strong protection.
What sets the Pro apart is an upgraded secure element that supports broader cryptographic algorithms and has been independently certified at a higher security standard. While the S’s secure element is solid for the average user, professionals or long-term holders might find the Pro's architecture more reassuring.
Another aspect is air-gapped signing. Neither wallet is fully air-gapped since both rely on Bluetooth connectivity to operate with a smartphone app. However, both use end-to-end encryption and secure pairing to minimize risk. I’ve tested Bluetooth on both extensively and didn’t detect any communications leaks or odd latency—though wireless always carries a marginal risk versus USB-only devices.
For those unfamiliar, think of the secure element like a vault inside your wallet that never exposes your private keys. Transactions get signed inside this vault; only signed approvals leave it.
If you want more detail on hardware wallet security in general, check out my security architecture breakdown.
Connectivity and User Experience
Bluetooth is the main connection method for both wallets, contrasting with those requiring USB or NFC. This offers flexibility: you can approve transactions on your phone without cables, which felt convenient in my daily testing.
On the downside, Bluetooth connectivity means relying on wireless pairing and encryption protocols that add a (very small) attack surface. Still, I found CoolWallet’s implementation robust with safeguards around pairing codes, session expiration, and encrypted messages.
The app interface is mostly consistent across both models, guiding users through wallet management, crypto sending, and firmware updates. Notably, the Pro sometimes felt faster or smoother due to its upgraded processor and memory.
A minor gripe I had was the brightness and responsiveness of the e-ink screen—especially on the S, it can be a tad sluggish in low-light conditions. This is a trade-off for battery efficiency and physical sturdiness.
If wireless connection concerns you, you might want to review my notes on connectivity Bluetooth USB NFC.
Supported Cryptocurrencies and Blockchain Networks
Both CoolWallet S and Pro support a wide selection of crypto assets. Their base support includes Bitcoin (BTC), Ethereum (ETH), and many popular altcoins, along with various tokens on the Ethereum network and some emerging blockchains.
The Pro has extended support for additional blockchains like Solana, which the S either lacks or supports to a limited extent. The upgrade reflects the Pro’s expanded crypto ecosystem ambition but comes with a slight learning curve for setup and asset management.
Here is an overview (partial list):
| Crypto Type |
CoolWallet S |
CoolWallet Pro |
| Bitcoin (BTC) |
Yes |
Yes |
| Ethereum (ETH) |
Yes |
Yes |
| Solana (SOL) |
Limited or none |
Full support |
| ERC-20 Tokens |
Yes |
Yes |
| Others (Tezos, etc.) |
Varies |
More extensive |
Crypto holders focused mainly on Bitcoin and Ethereum will find both devices suitable. If you dabble in other chains or DeFi-heavy setups, the Pro’s broader support is appealing.
More details about specific supported coins and tokens can be found on the supported coins page.
Seed Phrase and Backup Options
The seed phrase is the lifeline of any hardware wallet. Both CoolWallets generate a 24-word seed phrase following BIP-39 standards during setup. This is the traditional count for maximized entropy and recovery reliability.
Backing up this seed phrase is vital. Both wallets recommend writing it down carefully offline or using metal backup plates for resilience against fire, water, or loss—especially relevant for long-term holders. I personally use metal backup products in my setup since paper backups feel too fragile for anything beyond short-term.
Neither CoolWallet model includes native Shamir backup (SLIP-39) support, which some wallets use for splitting seed phrases into shareable fragments. This is a downside if you want multisignature-style distributed backups but not a dealbreaker for most use cases.
Both wallets support adding an optional passphrase—sometimes called the 25th word—which acts as a password to the existing seed phrase. Be cautious here: this adds a layer of security but also a risk of permanent loss if forgotten. What I’ve seen with users is a mixed bag of success with passphrases—great for advanced users, but potentially confusing and dangerous for newcomers.
If seed phrase management is new territory for you, check out my comprehensive seed phrase management guide.
Firmware and Software Updates
Both wallets receive regular firmware updates from the manufacturer aimed at patching vulnerabilities, adding new coin support, and improving usability. What stood out during my testing was the clear alert mechanism in the companion app and device screen—that’s vital to prevent ignoring update prompts.
Authenticity of updates is verified through cryptographic signatures. This means your device checks the update package before installation, adding a crucial layer of security against tampered firmware.
Users should never skip updates as outdated firmware can become vulnerable, especially when new exploits surface or new security features are rolled out.
For a detailed explanation of why firmware matters and how to safely update, see firmware updates.
Multi-signature and Advanced Features
Neither the CoolWallet S nor the Pro includes built-in multi-signature setups directly on the device. However, both can be configured to work in multi-signature wallets via compatible third-party wallets and interfaces.
Multi-signature means multiple devices or keys must approve a transaction before it goes through. This bolsters security by spreading trust—great for large holdings or shared funds.
That said, setting up multisig can be complex and may not appeal to beginners. My experience suggests that users comfortable with multisig usually employ additional tools beyond hardware wallets alone.
Pros and Cons Summary
| Feature |
CoolWallet S |
CoolWallet Pro |
| Design |
Ultra-portable card |
Slightly bulkier but more robust |
| Battery |
About 1 week |
Longer battery life (up to 2 weeks) |
| Secure Element |
Standard SE chip |
Upgraded SE with higher certification |
| Connectivity |
Bluetooth only |
Bluetooth with improved stability |
| Supported Cryptocurrencies |
Major coins & tokens |
Broader support including Solana |
| Seed Phrase |
24 words, BIP-39 |
24 words, BIP-39 |
| Passphrase Support |
Yes |
Yes |
| Multi-signature |
Via third-party wallets |
Via third-party wallets |
| Firmware Updates |
Secured & frequent |
Secured & frequent |
Who Should Consider Each Wallet?
If you’re someone who prioritizes daily portability and simplicity, with a focus on classic crypto like Bitcoin and Ethereum, the CoolWallet S fits nicely. It’s slim, discreet, and functional enough for most self-custody needs without extra bells and whistles.
On the other hand, if you want a hardware wallet with more robust security architecture, longer battery life, and broader coin support (including newer blockchains like Solana), the CoolWallet Pro is worth consideration—even if that means carrying a slightly larger device.
Neither wallet is designed for fully air-gapped or USB-connected enthusiasts who prefer zero wireless exposure. But for mobile-first users, both provide a solid Bluetooth experience.
Final Thoughts
Choosing between CoolWallet S and Pro isn’t about which one is objectively “better.” It comes down to your personal crypto security strategy and usage patterns. Want something slim and simple? The S shines. Need more power under the hood with extended crypto support? The Pro delivers.
Both have solid secure elements and follow industry-recognized standards, so you’re in good hands either way. Just remember: your seed phrase is the ultimate master key. Keep that safe above all.
Want to explore alternatives or broader strategies? Check out my comparison with other wallets and cold storage strategies.
Still have questions? The FAQ section covers common inquiries about hardware wallet recovery, Bluetooth safety, and more.
Ultimately, whichever CoolWallet you choose, make sure your self-custody approach matches your risk tolerance and long-term goals.
Happy securing!
