If you're looking for an Arkham alternative, Nansen is a full blockchain analytics suite that offers data from more than 20 chains and over 300 million labeled addresses. It has similar features to Arkham, including onchain data tracking, no-code analytics and customizable alerts. Nansen also offers a range of pricing tiers, including a free option, so it should be useful to a broader audience.
Another contender is CryptoQuant, geared for institutions and serious investors. It offers a lot of on-chain and market analytics tools, including real-time alerts, proprietary metrics and customizable dashboards. CryptoQuant's modular data packages and community-created custom metrics are worth a look.
If you're interested in AI tools, ChainAware.ai could be a good fit. It offers wallet analytics and fraud detection, and is a good option for security and user engagement. ChainAware.ai supports multiple blockchains and has a range of pricing tiers for individuals and businesses.